http://sloan.stanford.edu/MouseSite/1968Demo.html - Impressive demonstration using the first mouse and graphics display by Douglas C. Engelbart in the year 1968(!)
http://www.old-computers.com - Online Computer Museum
http://computer-modell-katalog.de - Computer Modell Katalog (german)
http://www.computer-archiv.de - Computer-Archiv (german)
http://www.computermuseum-muenchen.de - Computer-Museum München (german)
http://www.homecomputermuseum.de - Homecomputer-Museum (german)
http://www.vaxman.de - A lot of stuff about VAX, but also other historic machines and interesting projects (german)

http://wiki.splitbrain.org/wiki:dokuwiki - DokuWiki, the system, which manages the pages here
http://www.bloodshed.net/dev/ - Dev-C++, C++ develepment environment for Windows based on GCC
http://irrlicht.sourceforge.net - "Irrlicht", a 3D engine
http://www.chiark.greenend.org.uk/~sgtatham/putty/ - PuTTY, SSH client
http://www.wxwindows.org - WxWidgets, a class library for platform independant applications
http://www.gnupg.org - GnuPG, a free implementation of PGP

http://www.quinapalus.com/wi-index.html - The Wireworld Computer
http://www.99-bottles-of-beer.net/ - "99 Bottles of Beer" implemented in (nearly) all known programming languages