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Open the Windows is a collection of links to open source software for Windows users. Try to use free software on Windows, you'll find plenty of goodness!

Let's start...

Text writing and Office Suite

• OpenOffice
  Replaces Microsoft Office
  http://www.openoffice.org
• Notepad++
  Repaces Notepad
  http://notepad-plus.sourceforge.net

Internet & Communication

• Mozilla Firefox
  Replaces Internet Explorer
  http://www.mozilla.org/products/firefox
• Amsn
  Replaces MSN/Live Messenger
  http://amsn.sourceforge.net

Email

• Thunderbird
  http://www.mozilla.org/products/thunderbird

Multimedia

• Songbird
  Replaces iTunes
• http://www.songbirdnest.com
• VLC
  Replaces Windows Media Player
  Eccellente player multimediale
  http://www.videolan.org/vlc/
• Audacity
  Audio recorder and editor, replaces and extends Windows Sound Recorder
  http://audacity.sourceforge.net/

• The Gimp
  Replaces Adobe Photoshop
  http://gimp-win.sourceforge.net
• Inkscape
  Replaces Adobe Illustrator
  http://www.inkscape.org

• 7-Zip
  Replaces WinZip, WinRar and extends the default compress file management in Windows
  http://www.7-zip.org/
• Filezilla e Filezilla Server
  Good Ftp Client and Server
  http://filezilla.sourceforge.net
• Clam Av
  Antivirus
  http://www.clamwin.com/

Games

• Frozen Bubble
  Replaces Puzzle Bubble
  http://fb-win32.sourceforge.net
• Armagetron advanced
  3D racing game inspired by the Disney movie Tron
  http://www.armagetronad.net
• Cube
  Very fast FPS
  http://www.cubeengine.com
• Freedroid
  Isometric RPG (Diablo style) set in a science fiction environment
  http://freedroid.sourceforge.net
• Nexuiz
  FPS similar to Unreal Tournament, advised for online gaming
  http://www.nexuiz.com

Now, after all this free software for Windows, do you want a brief introduction to the Linux world?

A good page that describes and compares the major free operative systems is that of Distrowatch.