Windows Open Source applications

Although open source has its origin in the UNIX/Linux world, quite a lot of open source applications are available for Windows as well. I'll provide links to a few lists where you can pick up useful and interesting open source programs:

1. Google Pack - A good collection of open source Windows apps - Packed by Google
   http://pack.google.com/
2. WinLibre is a rigorous selection of free, legal software for Windows 98, 2000, XP with a easy to use direct-from-web installer.
   http://www.winlibre.com/en/
3. Open Source Windows - A simple list of the best free and open-source software for Windows
   http://www.opensourcewindows.org/
4. 20 Open Source Windows Apps For You - Blog note with a list of 20 useful open-source Windows applications across multiple categories.
   http://www.teknobites.com/2007/07/19/20-open-source-windows-apps-for-you/
5. 40+ Free Windows Apps For You - An expanded list of Windows open source software.
   http://www.teknobites.com/2007/09/08/40-free-windows-apps-for-you/

Portable Collections

1. Portable Apps - Suite of portable apps
   http://portableapps.com
2. Portable Freeware - A good collection of free and open source portable apps.
   http://www.portablefreeware.com/
3. winPenPack is an Italian website for portable applications with suites for essential apps, gaming, school and web.
   http://winpenpack.com