Really good, and free, software

Thought I'd throw these out there since more and more people are looking for alternatives to Microsoft, etc. Three really good, and free, applications:

1. Picasa v.2 - a free picture manager from Google = great
2. Firefox - the next generate of web browsers from Mozilla: small, light, and really powerful = great
3. Thunderbird - another app from Mozilla for all of your email needs: small, light, and powerful = good