Thanks to Theseus, I came across this site called the Freeware Mission which researches and lists the best free open source software on the market. Check out the entire list for yourself - it's pretty awesome. I know I just downloaded 6 programs right now and I'm freaking excited!

Start from here and keep a lookout on the right sidebar: http://www.freewaremission.com/2008/08/51-essential-programs-for-freeware-only.html