Steve hutchesson's MASM32 distribution (also a forum).

Netwide assembler.

Tomasz Grysztar's assembler.

Free C/C++ compiler for windows.

Free pascal compiler.

Home of the BASS audio library and various other goodies.

Gnu C Compiler.

Emacs - Extensible, real-time editor.

PS2 Homebrew Development.

An open-source SDK for PSP homebrew development.

C/C++ compiler for macintosh computers provided for free by Apple.

A handy colors selection tool.

A fine web browser.

Assembly programming under FreeBSD.

An impressive set of tutorials for OpenGL programming.

The Industry's Foundation for High Performance Graphics

All about C++

A huge database containing a lot of programming related materials.

Lots of tutorials about fractals and other mathematics amusments.

General-Purpose Computation Using Graphics Hardware.

"The world's leading source for pure technical x86 processor information."

"The place to start for operating system developpers."

Resources for games developments.

Resources for games developments too (free registration required to access the resources).

Resources for RPGs games programming.

Another forum related to assembly language on Windows.

3D game development with OpenGL.

Playstation 2, Playstation portable and Playstation 3 developments forums.

Forums about the Dingoo consoles and a few others.

"All good macs get liberated."

Consoles gaming/programming/hacking community.

Community about the MSX line of computers.

"The Place to Start for Operating System Developers."

Forums about the Amiga 68k.

Scene.org is a non-profit organization aimed at providing the 'electronic art scene' with a forum for communication and for sharing their work.

"We are providing a demoscene community and a content database for almost all platforms, combined with a nice forum to exchange the latest gossip and information."

Your online demoscene resource.

"Demozoo is a brand new site dedicated to documenting the demoscene - the productions, the parties, and the people who make it all happen - in more detail than ever before."

Scene portal containing a big archive of PC cracktros, e-magazines and tons of demoscene related links.

Amiga music, games and information.

"The TEXTFILES.COM Artscene Collection is meant to be a catch-all repository of packs, photos, artwork and other artifacts of various Art Scenes throughout computer history."

Huge ftp about Amiga demos.

"Amiga Music Preservation (AMP), a non profit association, is running the biggest and most comprehensive database ever about amiga music and amiga musicians."

The Resource Center for Free Operating Systems.

The home of the minimal unix.

A desktop oriented port of BSD.

"NetBSD is a free, secure, and highly portable Unix-like Open Source operating system available for many platforms."

"The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography."

"FreeDOS is a complete, free, DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or develop embedded systems. Any program that works on MS-DOS should also run on FreeDOS."

A good portal for calculators/computers/consoles emulation.

The home of the famed Amiga emulator for Windows.

Lot of docs, tips and hacks for older consoles.

Everything about the ZX spectrum and clones.

Docs and tools for various consoles.

"Pixel exact emulation of the Commodore 128,Commodore 64, VIC 20 and Atari 2600 written entirely in Java."

A PlayStation Portable emulator.