Editor's Note: This growing directory is manually maintained and automatically tested for broken links once a month. Links which appear broken for three or more consecutive months are deleted.

Should there be anything wrong with an entry, let me know and I will be glad to correct it.
Note: an entry can appear in several categories.

INSTITUTIONS, Associations and Groups

For a more generic Directory, see the Stan's links to Science Institutions.

• International:
• ACM the Association for Computing Machinery.
• FSF, the Free Software Foundation behind the GNU operating system.
• GNU Operating System. Developers, see the Savannah section and the list of open projects
• IADIS International Association for Development of the Information Technology.
• IEEE Computer Society portal.
• OpenMP, home page of the new parallel programming standard.
• Python Software Foundation behind the Python programming language.
• Qubit, dedicated to Quantum Computing.
• W3C Consortium. Maintains HTML, XHTML, XML formats.
• W3C MathML. Home of the Math Markup Language.
• Europe:
• FL&C, Formal Languages and Compilers Group at Politecnico di Milano, Italy.
• INRIA, French Institut National de Recherche en Informatique et en Automatique, France.
• NIC, John von Neumann Institut für Computing, Germany.
• USA:
• Humanoid Robotics Group at MIT.
• NIST's Information Technology Laboratory.
• NAMIC, National Alliance for Medical Image Computing.
• Optimization Technology Center at Argonne National Laboratory and Northwestern University.
  A true treasure trove. Includes NEOS Server and Guide, and OTC Research and Software.
• Elsewhere:

EVENTS: Conferences, Major Meetings, ...

• ACM events calendar.
• IADIS events calendar.
• Petri nets meetings and events.

JOURNALS, e-Zines, Libraries and Blogs

• CACM Communications of the ACM. Fast TOC browsing.
• Computing in Science and Engineering (CISE) of IEEE Computer Society and AIP.
• Free IT Engeneering white papers and magazines at TradePub (NetLine Corporation).
  An extensive list of free trade publications.
• IEEE Computer Society's digital library (lists all IEEE computing-oriented journals).
• Information Systems (ScienceDirect browser).
• Intel Parallel Universe Magazine.
• Mathematics of Computation of the AMS.
• e-Zines and Portals:
• DevArticles. Articles for software developers.
• DevX software development portal.
• Dr.Dobb's Journal.
• Intel Software Dispatch; you can subscribe for e-mail alerts.
• Intelligence in Software.
• Internet.com. The internet technology network.
• Petri Nets World portal. Excellent.
• PC World magazine.
• Scientific Computing (e-Zine).
• Scientific Computing World (e-Zine).
• X86. e-Zine
• Blogs:
• Sage: Open Source Mathematics Software managed by William Stein.
• ManjushaJoshi's Blog managed by Manjusha S. Joshi.

ENCYCLOPEDIAs, Dictionaries and Wikis

• CIE, Connected: an Internet Encyclopedia. Old (2001) but still worth a look.
• FOLDOC, the Free Online Dictionary of Computing.
• DADS. Dictionary of Algorithms and Data Structures at NIST.
• Virus Encyclopedia at Grisoft AVG.
• Webopedia Free computer and IT encyclopedia.
• Wikis:
• C++ Reference, a great Wiki indeed.
• Quantiki, dedicated to Quantum Computing.
• ILDJIT wiki, on Itermediate Language Distributed Just in Time.
  Part of a SourceForge project.
• Linux: Mandriva wiki.
• Mathematical Software on Wiki Slice. Very informative.
• PHP Wiki, born from the book Practical PHP Programming by Paul Hudson.
• R Wiki, statistical and graphics computing wiki of the R Project.
• Software on Wikipedia.
• Tcl/Tk Wiki dedicated to the Tcl language, including the Tk graphical toolkit.
• WikiWikiWeb started by Ward Cunningham.

DATABASES, Directories and Reference lists

• 3D2F software archives.
• ACM Collected Algorithms. Free for non-commercial use.
  Note: Files with no extension are plain text.
• BABEL, a glossary of computer-oriented abbreviations and acronyms.
• CERN Document Server, an open-access repository of articles, theses, ... Search for software.
• CoRR, Computing Research Repository at arXive. Huge and free. See also Front for arXive.
• Free Downloads Center, a huge server of free software.
• Handbook of Mathematical Functions by Abramowitz M., Stegun A., Editors.
• Mozilla Developer Center. A great web programming informtion database.
  You do not need to be a Mozilla developer to appreciate this treasure trove.
• Netlib Repository of mathematical software, papers, and databases.
  There is also a netlib mirror at Sandia National Labs.
• Statistics articles repository at arXive. Free.
• Stony Brook Algorithm Repository, by S.S.Skiena. Code for 75 algorithms. Great!
• Technical Reports of the Computer Laboratory of the University of Cambridge.
  Over 700 freely accessible PDFs.
• Link lists:
• C++ Resources Directory.
• FIDB, Fachvörterbücher Informatik. German.
• FreeScience directory of free scientific computing software.
• Komtoo, an interesting Directory.
• Object-Oriented Numerics. Formidable.
• OpenMP Resources for parallel programming.
• Scientific Computing directory compiled by M.T.Heath.
• WebRing of Computer Science.
• References, Bibliografies, and Books lists:
• ACM online Books & Courses. Free for ACM members.
• Books about Software, Programming, Algorithms, ....
  A huge list maintained by Stan Sykora (see also the online books section).
• Collection of Computer Science Bibliographies. Amazing.
• Computer books. Very useful.
• Computer Science at the MIT Open CourseWare initiative. Free courses and books.
• DBLP (Computer Science Bibliography) at Universität Trier. Amazing.
• Free Books on programming, computer science, databases, and operating systems.
• Free Programming and Computer Science Books. Very useful.
• FreeScience directory of free, online computer science books.
  A very valuable resource, though it counts as books also courses and scripta.
• Online computer books. A huge list of free Computer Books, eBooks and Online Books.
• Open source Computer Science Textbooks at Textbook Revolution.
• Semidefinite Programming. A huge directory maintained by Christoph Helmberg.

HISTORY and Milestones

• 50 Years of Information Technology, an article by Jacinda Frost.
• Abacus, the art of calculating with beads. By Luis Fernandes (Elf).
• Computer History Museum, a great place to visit.
• History of Computing project.
• History of Software Engineering on Wikipedia.
• Konrad Zuse internet archive.
• Software Industry Special Interest Group, part of Computer History Museum.
• The History of Programming Languages poster on O'Reilly.
• W.K. Hastings, Statistician and Developer of the Metropolis-Hastings Algorithm.
• Milestones:
• Fundamentals of Computer - Historical Milestones in the Development of Computers, notes.
• Milestones in Computer Development, by Carl Swanson.

EDUCATION and Fun

• A list of free online software books, courses and theses
• A Brief Maxent Tutorial by Adam Berger.
• Algorithms and Complexity, a free online book by Herbert S. Wilf. Buy 2nd Edition.
• C Reserved Identifiers by Stan Brown. Old, but well written and still useful.
• C++: A Dialog, a nice text by Steve Heller.
• C++ Optimization Strategies and Techniques by Pete Isensee. See also Pete's other stuff.
• Category Theory for Computing Science by Michael Barr and Charles Wells.
• Compact Guide to Lex & Yacc by Thomas Niemann, or how to build a compiler.
• Complex Analysis Project for undergraduates by John H.Mathews. See the modules.
• Computational Introduction to Number Theory and Algebra by Victor Shoup.
• Computer Architecture and Interfacing to Mechatronic Systems,
  an online book by Dario J.Toncich.
• Computer Science at the MIT Open CourseWare initiative. Free courses and books.
• Data Structures and Algorithms with Object-Oriented Design Patterns in C++ book
  by Bruno R.Preiss. Also available in Java, C#, Python, Ruby, Lua, Perl, and PHP.
• Eric's Book about Linux by Eric Forsberg.
• Function X Tutorials: C++, C#, Java, HTML, JavaScript, etc., etc.
• Free online books. A list maintained by Stan Sykora.
• Foundations of Cryptography by Oded Goldreich
  (related and complementary postsript texts). Printed book >>
• Guide to Computer Training Resources. Cool articles and links.
• Graph Algorithms by Shimon Evan (Chapters 1-6, .ps format). more >>
• Information Theory, Inference, and Learning Algorithms,
  an online book by David MacKay. Available also in print.
• Introduction to Complexity Theory by Oded Goldreich. Two sets of lecture notes.
• Introduction to the Conjugate Gradient Method Without the Agonizing Pain (pdf, 64 pages)
  by Jonathan R.Shewchuk at Carnegie Mellon.
• Introduction to Modern Cryptography by Mihil Bellare and Phillip Rogaway. A Course.
• Lecture Notes by M.T.Heath, corresponding to his book on Scientific Computing.
• Lecture Notes on Cryptography by S.Goldwasser and Mihil Bellare. A Course.
• Lectures Notes on Optimization by Pravin Varaiya.
  Online PDF re-issue of a book out of print since 1975.
• Lexical Analysis and Parsing using C++
  by Bruno R.Preiss. 390-page PDF.
• Mathematical Optimization by the Computational Science Education Project.
  Online book on unconstrained and global optimization (HTML and PostScript). Very good!
• Mathematics for Algorithm and Systems Analysis, a free textbook
  by Edward A. Bender and Gill S. Williamson.
• MathCS, resources for anyone interested in Mathematics, Statistics, Java Programming, or Robotics.
• MIT Open Courses in Electrical Engineering and Computer Science. Free.
• MERLOT. An amazing educational resource.
• Modern Cryptography, Probabilistic Proofs and Pseudorandomness by Oded Goldreich
  (related and complementary postsript texts). more >>
• Numerical Analysis Project for undergraduates by John H.Mathews. See the modules.
• Object-Oriented Software Engineering by J.McCormack.
  Course CSE2305 at Monash University.
• Operator Precedence Parsing by Thomas Niemann.
• Optimizing C and C++ Code at EventHelix.
• PHP tutorial by Paul Hudson (go to end of the page). Excellent.
• Planning Algorithms book by Steven M. LaValle (1023 pages, Cambridge Uni Press 2006).
• Randomized Methods in Computation by Oded Goldreich. Lecture notes.
• Rough Set Data Analysis: A road to non-invasive knowledge discovery, a primer by Ivo Düntsch and Günther Gediga.
• Software carpentry by Greg Wilson. Scientific computing in Python.
  The goal: to speed up software development by scientist.
• Security Engineering: A Guide to Building Dependable Distributed Systems by Ross Anderson, Complete 1st Edition and selected Chapters of 2nd Edition. Printed book >>.
• Software Tutorials on ATLAS Computing (DocuShare).
• Sorting and Searching Algorithms: A Cookbook by Thomas Niemann.
  Attention: Updated and expanded version of this free book is available from ePaperPress
  in 4 languages (English, Russian, Italian and French).
• Structure and Interpretation of Computer Programs a free course at MIT Open Courseware. Zipped 41 Mb. Based on the printed book by H.Abelson and G.J. and Julie Sussman.
• Teach yourself C in 21 days, online popular book by Peter Aitken and Bradley L.Jones.
• Tutorials by Olfa Nasraoui (Uni Luisville). Nice articles about web mining, www personalization, genetic optimization, robust statistics and clustering.
• Visual Basic Collections and Hash Tables by Thomas Niemann.
• Web-Database Programming: CGI and Java Servlets. A tutorial at Uni Stanford.
• Writing C/C++ Macros: Rules, Tricks and Hints by Stan Sykora. See also this.
• Ynot Logic Simulator: A literate C++ program
  by Bruno R.Preiss. 176-page PDF plus source-code.
• Fun:
• An Amazing Algorithm.
• Ananthapuri IT/Software jokes.
• Computers and software humor. A list of links on the Open Directory.
• Hacker's Wisdom, links edited by Luis Fernandes (Elf).
• Programmers jokes at WorkJoke.
• XKCD comics.

INFORMATION Sources, Articles and Libraries

• Algorithms for Programmers by Jörg Arndt. Nice open project and a book (pdf, 970 pp).
• ARM Assembly Language Programming, an online book by Pete Cockerell.
• Autoregressive Modeling: Elementary Least-Squares Methods, an online text by H.Thornburg.
• CoRR, Computing Research Repository at arXive. Huge and free. See also Front for arXive.
• Finite Field Arithmetics with code snippets. A Chapter from the Guide to Eliptic Curve Cryptography by Darrel Hankerson, Alfred Menezes and Scott Vanstone.
• Genetic Algorithms Library by Mladen Jankovic.
  A long article with C++ code at Code Project. Excellent.
• Geometry, Surfaces, Curves, Polyhedra at the site of Paul Bourke.
  Lots of geometric algorithms.
• Handbook of Applied Cryptography
  by Alfred J.Menezes, Paul C. van Oorschot and Scott A.Vanstone. Printed version.
• Home site of Paul Hudson. A PHP book and lots of articles.
• Home site of Hans D.Mittelmann. A treasure trove on numerical math and optimization methods.
• Home site of Robert Munafo. Eclectic, very interesting.
• Home site of Jim Weigang. A treasure trove in/about APL language. Articles and lots of code.
• Home site of Andrew Zisserman. Excellent PDF's.
  Courses: Optimization, Estimation & Inference, Computer Vision, 2D Signal Analysis.
• C/C++ Languages info on Microsoft's MSDN.
• IEEE 754. Floating point format.
• Matlab manual for humans (but does not cover much of the ground).
• Mathematica SourceCode. Applications and examples with source code.
• MaxEnt and Exponential Models by Adam Berger.
• Numerical Recipes by Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P.
  Subscribe to the newest C++ verion, or consult chapters of older versions. Excellent.
• On LISP, a free book by Paul Graham.
• OpenMP Resources for parallel programming.
• Pre-Defined Compiler Macros, a sourceforge.net project.
• Quantum Factoring Algorithm site of Ashok Muthukrishnan. Contains a nice pdf article.
• Scientific Computing. Algorithms and information source.
• The Matrix Cookbook, a free mathematical desktop reference on matrices
  by Kaare B.Petersen and Michael S.Pedersen. Great.
• Wavelets - all there is to know about them. Do not miss this one!
• Articles:
• Articles by Albert Tarantola:
  = Popper, Bayes and the Inverse Problem,
  = Probabilistic Approach to Inverse Problems (with Klaus Mosegaard)
  = Monte Carlo Sampling of Solutions to Inverse Problems (with Klaus Mosegaard)
  and more ...
• C++ Portability Guide at Mozilla Developer Center. Very detailed. A must read.
• Comparison of computer algebra systems, an useful article on Wiki Slice. Lots of up-to-date links.
• Designing and Building Parallel Programs, a book and a project by Ian Foster.
• DevArticles. Articles for software developers. Good.
• Distributed Extreme Programming
  by Michael Kircher, Prashant Jain, Angelo Corsaro and David Levine.
• Downhill Simplex Method for Many (~20) Dimensions on Grzegorz Kaczmarczyk's site.
• Dynamic Programming Algorithm (DPA) for Edit-Distance
  by Lloyd Allison at Monash University.
• Efficient Algorithms for Sorting and Synchronization, a Thesis by Andrew Tridgell.
• Extreme Programming: a gentle introduction by Don Wells.
• Netlib Repository of mathematical software, papers, and databases.
  There is also a netlib mirror at Sandia National Labs.
• Strategies to build human-level-intelligence atrificial brain by Grzegorz Kaczmarczyk.
• Tech Notes by Will Bryant. Some very good stuff on C++, #C and #web features.
• Why functional programming matters by John Hughes. Haskell and not only.
• Text libraries:
• Stan's Library section on programming.

SPECIAL TOPICS: Drivers, RTOS, AI, Crypto, Matrices, Optimization

• Drivers development:
• EFG Library. Lots of mostly free stuff.
• EnTech Taiwan. Libraries for driver-developers. Kick out huge, user-unfriendly Win32 DDK's.
  I have used their TVicHW32. Great.
• Jungo Driver Development. Nice, very professional, but expensive.
• Lakeview Research. Interfaces: USB,Serial,PP,Ethernet, ... Great.
• TinyPort. Free.
• TVic. Driver & Ring0 development stuff. Nice and low-cost.
• Zeal Soft Studio. Simple access to parallel ports and ring 0 memory, plus Win32 developer tools.
  I have used with NTPort and MemAccess Libraries. Great and affordable !!!
• Real-Time Operating Systems:
• ANTOS, configurable RTOS for x86 systems. Free.
• AVIX RTOS for a range of micros.
• BeRTOS low-cost open-source system for several architectures; with Windows SDK.
• ChibiOS/RT is a free sourceforge project. Very respectable.
• eCos, a free RTOS with a wide community of buffs.
• eCosPro a commercial evolution of eCos from eCosCentric.
• FreeRTOS, popular RTOS for 26 architectures. Low-cost derivations: OpenRTOS, SafeRTOS.
• uC/OS-II from Micrium. Low Cost RTOS for many micros.
• OSE RTOS from ENEA.
• QNX, a widespread commercial RTOS.
• RTAI, Real-Time Application Interface for Linux.
• RTLinux from Wind River. Scalable versions, starting free for Academy.
• RTOS info on Wikipedia. See also the List of RTOS.
• Salvo, an RTOS for very-low-cost embedded systems with very limited space.
• Sciopta RTOS puts accent on certified safety.
• ThreadX from Express Logic is low-cost and very compact.
• TinyOS, an open-source OS for wireless embedded sensor networks, and beyond.
• WxWorks from Wind River, an upper-bracket RTOS.
• Windows CE, the Microsoft RTOS.
• Artificial Intelligence:
• CyCorp, founded to research, develop, and commercialize Artificial Intelligence.
• Humanoid Robotics Group at MIT.
• Machine Learning, Neural and Statistical Classification, a free online book
  edited by D.Michie, D.J.Spiegelhalter and C.C.Taylor.
• OpenCyc, home of the homonymous open-source project.
• Cryptography:
• Finite Field Arithmetics with code snippets. A Chapter from the Guide to Eliptic Curve Cryptography by Darrel Hankerson, Alfred Menezes and Scott Vanstone.
• Foundations of Cryptography by Oded Goldreich
  (related and complementary postsript texts). Printed book >>
• Handbook of Applied Cryptography
  by Alfred J.Menezes, Paul C. van Oorschot and Scott A.Vanstone. Printed version.
• Introduction to Modern Cryptography by Mihil Bellare and Phillip Rogaway. A Course.
• ISO 18033-2: A Standard for Public-Key Encryption on the site of Victor Shoup.
• Lecture Notes on Cryptography by S.Goldwasser and Mihil Bellare. A Course.
• Modern Cryptography, Probabilistic Proofs and Pseudorandomness by Oded Goldreich
  (related and complementary postsript texts). more >>
• Fourier and other Integral Transforms:
• FFTPACKS a free Fortran library developed at the National Center for Atmospheric Research.
• FFTW, a free C library for DFT in 1 or n dimensions, arbitrary size real and complex data.
• FXT, an amazing library of fast transforms and low level algorithms.
• Mathematics of the Discrete Fourier Transform (DFT) with Audio Applications,
  by J.O.Smith III.
• Radon Transform presentation by Min Wu in a medical imaging context.
• Inverse Laplace Transform:
• C# ILT implementation by Walt Fair Jr. at Code Project (Stehfest algorithm).
• CONTIN on the site of its father, Stephen Provencher.
  Contains also his DISCRETE and SplMod packages. Free Fortran sources.
• Jacobi Polynomials Used to Approximately Invert the Laplace Transform,
  by A. Al-Shuaibi and F. Al-Rawajih.
• Regularization Method for Numerical Inversion of Laplace Transforms,
  a site of Vladimir Krizhniy.
• Mathematica source code: Numerical ILT.
• Numerical methods for the inversion of the Laplace transform,
  a very nice page maintained by Peter Valkó. Includes a list of > 1500 references!
• Matrices and Linear algebra:
• BlueBit's Active X matrix algebra components and libraries.
• LAPACK, the Linear Algebra PACKage available at NetLib (free).
  This is Fortran 77 version with links to other versions. For the C++ version, see LAPACK++
  There is also a netlib mirror at Sandia National Labs.
• Matrix computations in C (the Meschach's book) code on a David Stewart's page.
  Much on this page is broken, but get the mesch12b.zip complete matrix library file.
• PuLP, a linear programming modeler Python code by J-S.Roy.
• ScaLAPACK, similar to LAPACK, but concentrating on sparse and band matrices.
  The rich Users Guide of this project is worth seeing.
  There is also a netlib mirror at Sandia National Labs.
• The Matrix Cookbook, a free mathematical desktop reference on matrices
  by Kaare B.Petersen and Michael S.Pedersen. Great.
• Optimization and Data Fitting:
• Adapted Nelder-Mead, a downhill-simplex application article by A.Prsa and T.Zwitter.
• Autoregressive Modeling: Elementary Least-Squares Methods, an online text by H.Thornburg.
• COBYLA, a derivative-free constrained Powell method C code by J-S.Roy.
• Convex Optimization, an online book by Stephen Boyd and Lieven Vandenberghe.
  Printed copy also available.
• DataFit application and DataFitX DLL from Oakdale Engineering. Commercial.
• Decision Tree for Optimization Software on Hans Mittelmann's site. Very useful.
  See also this optimization benchmarks page.
• Downhill Simplex Method for Many (~20) Dimensions by Grzegorz Kaczmarczyk.
• Genetic Algorithms Library by Mladen Jankovic.
  A long article with C++ code at Code Project. Excellent.
• Function minimization by downhill simplex in APL on the site of Jim Weigang.
• Introduction to the Conjugate Gradient Method Without the Agonizing Pain
  by Jonathan R.Shewchuk at Carnegie Mellon.
• Lectures Notes on Optimization by Pravin Varaiya.
  Online PDF re-issue of a book out of print since 1975.
• Levenberg-Marquardt nonlinear least squares algorithms in C/C++ by Manolis Lourakis.
  Almost an encyclopedia on LM. Continuously updated, it contains many links and free source code.
• Mathematica source code: Genetic Algorithms. A tutorial with source code; by Mats Bengtsson.
• NLREG, a NonLinear Regression and Curve Fitting software package. Commercial.
• Optimization Lectures by Andrew Zisserman. Four very good PDF's and many links.
• Optimization Algorithm Toolkit (OAT) by Jason Brownlee on SourceForge.
• Optimization methods presented by John H.Mathews. Scroll to the last section.
• Optimization Technology Center at Argonne National Laboratory and Northwestern University.
  A true treasure trove. Includes NEOS Server and Guide, and OTC Research and Software.
• OTC Software. PCx, OOQP, KNITRO, CG+, DGSOL, L-BFGS, TRON, ICFS, COPS; all free.
• Sequential Simplex Optimization (PDF 3.8 Mb), a free online book by Walters F.H., Morgan S.L., Parker L.R.Jr., Deming S.N., CRC Press 1991. Licensed electronic reprint 1999.
• TNC, truncated Newton method C code by J-S.Roy.
• Arbitrary precision development tools:
• apfloat, a quite large, free C++ and Java library aiming at high performance. Impressive.
• GMP - the GNU Multiple Precision Arithmetic Library, a great, free, and professional resource.
• MAPM a Portable Arbitrary Precision Math Library in C, by Michael C.Ring. Oldish, but still nice.
• PARI/GP, another great resource, especially for numeric math research. Does also some symbolic Math. Comes with a free calculator and a set of fancy functions. See also a PARI/GP tutorial by Robert B. Ash.

SOFTWARE DEVELOPERS: Sites, Forums, Tools and Utilities

• Sites for Software Developers:
• ASPN, the Active State Programmer Network.
  Free access to valuable programming resources for Perl, Python, PHP, Tcl, and XSLT,
• Code Guru at Internet.com.
• Code Project a huge developers forum. Lots of free code.
• DevArticles. Articles for software developers. Good.
• DevX software development portal.
• Free Downloads Center, a fuge server of free software.
• Free Programming Resources.
• IBM software portal.
• Intel Developers site.
• Mathematica SourceCode. Applications and examples with free Mathematica source code.
• MS Developers Network (MSDN) worldwide site.
• Standard Template Library Programmer's Guide. Concise and good.
• The Free Country. A most valuable server of free tools for developers.
• Sites of Software Developers:
• Lakeview Research of Jan Axelson. Interfaces: USB,Serial,PP,Ethernet, ... Great.
• Home site of Kenneth P.Baclawski, expert in ontology based computing (semantic web, ec).
• Home site of Ingo Berg, father of muParsesr.
• Home site of Douglas Wilhelm Harder. Math and electronics oriented software.
• Home site of Pete Isensee. He writes software for games.
• Home site of Steve Miller, a Win32 programmer. He offers a number of small & handy free utilities.
• Home site of Jean-Sébastien Roy. See his collection of open-source code (C, Fortran, Python).
• Home site of Joel Spolsky; software developer & author of books and articles.
• Home site of Andrew Tridgell at Samba. Lots of free code and a collection of useful junkcode.
• Home site of G.Urroz. Computing and a lot of other stuff.
• Forums and public projects:
• Code Project. Windows developers community (primarily .NET but also C++, C#, etc).
• Earth Web. Lots of freeware and shareware,....
• Globus Alliance. Community developing the technologies behind the Grid.
• Intel Software Network. Why not register? It does help.
• SourceForge.net. Collaborative open-source development projects.
• Tools, Utilities and Code snippets:
• AMS - Advanced Microsystems. Large set of low cost cross-assemblers for all kinds of micros.
• Bison a free GNU parser generator.
• BlueBit's Active X matrix algebra components and libraries.
• CCAA, The Complete Collection of Algorithm Animations. Great!
• Circuit Design simulation Component 4.0. Free C++ GUI source code Win32 from uCanCode,
  distributed by Brothersoft. Not just electronics!
• DADS at NIST (Dictionary of Algorithms and Data Structures).
• Delaunay Triangulations, a Chapter from Computational Geometry by Mark de Berg et al.
• Dependency Walker utility for Win 32 DLL developers. Available for all platforms. Free and good.
• Fibonaccian search in C by Manolis Lourakis.
• Flex home page (an open SourceForge project). Flex is a tool to generate programs
  which recognize lexical patterns in text (scanners).
• Free Site. Lots of freeware and shareware,....
• Genetic & Evolutionary Algorithms toolbox.
• ImageJ, free Java image processing tools from the NIH Research Services Branch.
• Intel Open Source and its Libraries.
• Intel Threading Building Blocks for those doing multi-threading. Free.
  See also the book and this document.
• Java Scripts Source. Over 2300 free scripts!.
• Math code snippetts from Douglas Wilhelm Harder. Number systems in C++ and Java; fuzzy logic, etc.
• MathCS, resources for anyone interested in Mathematics, Statistics, Java Programming, or Robotics.
• muParser, free math expression parser library by Ingo Berg. Great.
• NTL: A Library for doing Number Theory by Victor Shoup.
• Numbers, constants and computation by X.Gourdon and P.Sebah. Some nice algorithms.
• OpenJPEG library. Free JPEG 2000 library and tools.
• PARI/GP, a great arbitrary precision resource, especially for numeric math research. Does also some symbolic Math. Comes with a free calculator and a set of fancy functions. See also a PARI/GP tutorial by Robert B. Ash.
• Plouffe's Inverter and Table of Constants, a database of over 215'000'000 of them.
• Programmers Heaven. Freeware, shareware,.... [broken ???]
• RIES, the Inverse Equation Solver, on Robert Munafo's website.
• RoboHELP. Expensive WinHelp development package.
• Savannah, the developer's section at GNU. See also the list of open GNU projects
• Software Verify. Low-priced development tools.
• StatLib. Lots of stuff for scientific software programmers.
• Stony Brook Algorithm Repository, by S.S.Skiena. Code for 75 algorithms. Great!
• String matching algorithms. A nice collection.
• System Internals. Freeware Windows info and tricks.
• Win Site. Freeware, shareware,....
• Compilers, Languages, IDE's and OS's:
• Algol page on the Open Directory (DMOZ) containing further links.
• BC, a free (GNU) compiler of the BC language,
  similar to C, but with arbitrary numeric precision.
• C++: A Dialog, a nice text by Steve Heller, plus a free compiler.
• C++ to C# free source translator.
• Code::Blocks, a free C++ compiler with a nice IDE.
• Dev-C++. Free C++ compiler for Win32. Publisher: Bloodshed Software.
  Uses GCC compiler and Mingw or Cygwin libraries. Updated in Sep 2011.
• Dive into Python.
• Fortran M home page. Fortran with parallel computing extensions.
• FreeBSD home page. A free UNIX-based operating system for Intel-type processors.
• Haskell home page. A free, popular functional programming language (as opposed to imperative ones). See also the Try Haskell tutorials.
• IDA Disassembler from Hex-Rays, excellent tool (not just for hackers and reverse engineers).
  Both pro and [reduced] freeware versions are available.
• Itanium, explicitly parallel dialect of Java for scientific computing on large-scale multiprocessors.
• Learning to Program ... in Python. Essentially the home site of Alan Gauld.
  Translations into Czech, German, Korean, Italian, Portuguese and Spanish!
• Linux Mandriva home and wiki.
• Microsoft Visual Studio Express, free development IDEs for Windows using Basic / C# / C++.
• Oberon of N.Wirth and J.Gutknecht at ETH. A modern integrated software environment.
  Single-user, multi-tasking, runs on hardware or on top of a host operating system. Free.
• OpenMP Compilers and API's for parallel programming.
• Python language home. Free, open-source, handy, but slow (interpreted).
• Python Tutorial for Non-Programmers on Wikibooks.
• QT home page. Cross-platform application framework.
• Smalltalk home page. Grandfather of object-oriented languages. Free.
• Squeak home. Successor of SmallTalk. Free.
• Tcl/Tk, a non-programmer's introduction.
• Tcl Developer Exchange, a great site dedicated to the Tool Command Language.
• Tcl/Tk on Free Programming Resources. Great starting point.
• Turbo C 3.0 free C++ compiler from Borland with IDE and debugger.
• Turbo Pascal to C/C+ (win) free converter.
• Visual C++ Express Edition 2008. Free C++ compiler for Win32 from Microsoft Corporation,
  distributed by Brothersoft.
• vxDev-C++, a free C++ compiler with a nice IDE, fully compatible with vxWidgets !!!
• WINE a compatibility layer for running Windows programs under Linux, FreeBSD, Mac OS X, Solaris, ...
• wxWidgets home. C++ API for GUI's on Windows, Linux, UNIX, Mac OS X, ... Free !!!
• Code editors for developers:
• Crimson Editor. User friendly, powerful and free. The site also links to a number of other free editors: Vim, PSPad, ConTEXT, NoteTab, EditPad, EditPlus, UltraEdit, TextPad, EmEditor.
• PSPad, a freeware programmer's editor running under Windows. Available in many languages.
• Scintilla, a nice SourceForge project; started to improve Python Win, grew beyond.
  Configurable; comes with sources. See also the PARI/GP interface.
• Management of software development:
• CVS, the Concurrent Versions System maintained by Ximbiot. Free (GNU).
• SVN, the Concurrent Versions System maintained by Tigris. Free versions.

Sci-Tech Applications / Utilities, File handling, 995, ...

• Adept Scientific. Lots of nice but rather expensive science-related software.
• AVG antivirus from Grisoft. I use this one. Click here to get the free version.
• Brothersoft a huge repository of freeware and shareware utilities.
• Comparison of computer algebra systems, an useful article on Wiki Slice. Lots of up-to-date links.
• Calc98, pretty good and free multi-mode calculator.
  There is also a reduced-functionality online version (jCalc).
• Calculator++, a cross-platform (Java) arbitrary-precision calculator.
• Crimson Editor. User friendly, powerful and free. The site also links to a number of other free editors: Vim, PSPad, ConTEXT, NoteTab, EditPad, EditPlus, UltraEdit, TextPad, EmEditor.
• Dependency Walker utility. Available for all platforms. Free and good.
• EventStudio System Designer, sequence diagram based engineering and design tool.
• FogBugz, software projects management for smart people.
• FreeScience directory of free scientific computing software.
• GNU Free Software Directory, free, serious, official. And GREAT.
• GnuPlot, free, portable, command-driven, interactive, multi-platform data and function plotting utility.
• Googol+ from Atelier Web is real great if you need an arbitrary-precision calculator.
• ImageJ, free Java image processing software from the NIH Research Services Branch.
• MacKichan home. Scientific Word + Latex editor with a math engine.
• MAGMA home. Magma is a major computational algebra system. Expensive.
• Maple home. Another major software packege to do Math. Expensive.
• Mathematica home. The symbolic math jewel - plus a fabulous math database. Expensive.
• Matlab home. We all use it at least sometimes, of course. Expensive.
• NumPy fundamental scientific computing package using the Python language.
  See also SciPy (both are free and open-source).
• O-Matrix, technical computing environment and matrix-based scripting language.
• Octave, a free Matlab-compatible (almost) package and public project. Excellent.
• Omni Group software utilities for Mac OS X.
• OpenCyc artificial intelligence package.
• OTC Software. PCx, OOQP, KNITRO, CG+, DGSOL, L-BFGS, TRON, ICFS, COPS; all free.
• PC Pitstop internet utilities.
• Poly Software international, home of PSI-Plot, ProStat, PSI-Chart.
• POV-Ray, Persistence of Vision Raytracer,
  is a free tool for three-dimensional graphics. See also.
• Process Library online utility describes named processes. Useful.
• QC expert, a statistical software from Trilobyte.
• R Project; free, open-source statistical computing and graphics project for Unix, Windows, MacOS.
• RAR and WinRAR archivers unpack RAR,ZIP,CAB,ARJ,LZH,TAR,GZ,ACE,UUE,BZ2,JAR,ISO,7Z,Z.
• Remote control of distant computers.
• S-Plus from Insightful (expensive).
• SAGE, a free mathematics software system licensed under the GPL. Uses the Python language.
• SCILAB, a free competitor of MATLAB. Excellent.
• SciPy open-source software for math, science, and engineering using the Python language.
  See also NumPy.
• Smooth Draw. Comfortable Utility for free-hand drawing.
• StatLib. Data, Software and News from the Statistics Community.
• Total Commander, a shareware file manager (shell) for Windows (all types).
  Resembles the old DOS Norton Commander but is much more powerful.
• Unscrambler from CAMO is all you will ever need for multivariate analysis.
• WINE. Good starting point for those who want to break from Windows to Linux.
• File handling, viewing, converting and recovering:
• 123 FileConvert. PDF to/from Word converter and a versatile image format converter. Low cost.
• Aeseus lost data recovery package.
• C++ to C# free source translator.
• CppDoc generates HTML documentation for C++ classes from your C++ source code. Great.
• DjVu document format home page. See also WinDjView.
• Data Rescue low-cost file recovery software for Mac.
• How to Recover Deleted Files with Free Software, an article on LifeHacker.
• LaTeX Editor. Free LaTex editor & IDE for Windows distributed by Brothersoft.
• Mathematical Illustrations by Bill Casselman. Includes code.
• PC Inspector File Recovery freeware recovers deleted/badly lost FAT12/16/32 and NTFS files.
• PDF Online converts for free documents of nearly any format to PDF.
  They sell affordable PDF API libraries for most programming languages.
• Pdf 995 virtual printer. Anything you print becomes a PDF document.
• Postscript software: GhostSript, GhostView, GV, GSView, RedMon, etc. Free (GPL).
• Recuva freeware for all kinds of Windows. Recovers deleted files.
• SGV Sarc. Generators of flowcharts from C/C++ source code + code editors. Commercial.
• Total Commander, a shareware shell for Windows (all versions).
  Resembles the old DOS Norton Commander but is much more powerful.
• Turbo Pascal to C/C+ (win) free converter.
• Undelete Plus freeware for all kinds of Windows. Recovers deleted files.
• WinMerge. Compares, differentiates and merges text files. Free, powerful utility for Windows.
• The 995 initiative:
• Backup 995. Intelligent backups manager.
• Ftp 995. powerful FTP-client for Windows 9x, ME, NT4, 2000 and XP.
• OmniFormat document conversion/manipulation. 75 formats.
• Open Office 995. A powerful competitor of MS Office.
• Pdf 995 virtual printer. Anything you print becomes a PDF document.
• PhotoEdit 995 image manipulation utility.
• SearchWithin. Search in msword, html, pdf, xls, ppt, ...
• Signature 995. High level protection for Internet communications.
• Zip 995. Advanced zipper/unzipper.

Various COMPANIES (except those already named)

• A+ Perfect Computers specialize in data recovery from faulty flash drives and memory devices.
• CloakWare deals in [data] security issues.
• Codeplay, Advanced C/C++ compilers and technologies for parallel processors. Scottish.
• EnTech Taiwan. Libraries for driver-developers. Profi display, graphic and monitor software utilities.
  I have used their TVicHW32. Great and low-cost.
• EventHelix. Home of EventStudio System Designer.
• Extreme Optimization has extensive numerical libraries for .NET.
• Ghisler, home of Total Commander.
• Grisoft, home of the popular AVG antivirus and other PC security tools.
• Hex-Rays, home of the popular IDA disassembler.
• IBM. They used to have a big, fat monopoly - once.
  They made it possible for mankind to produce errors many orders of magnitude faster than before.
• Intecs, Informatica e tecnologia del software. Italy.
• Intel. Co-founded in 1968 by Gordon E.Moore, the father of the Moore's Law.
• Maplesoft, home of Maple and MapleSim.
• MathSoft. Home of Matlab.
• Microsoft. Home of Windows. There is no limit to what they can make crash.
• NLREG does nonlinear regression and curve fitting.
• Oakdale Engineering does curve fitting gear (DataFit application and DataFitX DLL).
• QArchive. Lots of low-cost stuff.
• SciStore. Scientific Software with accent on Chemistry.
• SGI. Technical computing.
• SGV Sarc. Generators of flowcharts from C/C++ source code + code editors.
• TrollTech. Home of QT, a cross-platform application framework, and Qtopia.
• Wolfram Research. Home of Mathematica. The Company created by Stephen Wolfram.
• Zeal Soft Studio. Simple access to parallel ports and ring 0 memory, plus Win32 developer tools.
  I have used with success their NTPort and MemAccess Libraries. Great and affordable.