(Freeware and open source :-p )
click on the pictures for larger views 
Firefox http://www.getfirefox.com
Best internet Browser, bar none. Supports skins, addons, integrated google search, and is standards compliant.
KompoZer http://www.kompozer.net
Best web authoring application out there. I prefer this although I have a copy of Dreamweaver installed under WINE, I still prefer KompoZer, I love it’s intuitive interface. It even has a built in CSS editor.
Frets On Fire http://fretsonfire.sourceforge.net
Frets on Fire is an awesome guitar hero clone that you play with your keyboard. It is compatible with Guitar Hero songs.
Evolution eMail Client http://gnome.org/projects/evolution/
An awesome email client, like Outlook without the high price. Also available for Windows and Mac.
OpenOffice.org http://www.openoffice.org
Complete office suite with MS Office file compatibilty. GET IT NOW
This list will be added to soon!
