Some years back I became acquainted with Techsoup while working for a nonprofit as the Technology Director.  At the time I was grateful for inexpensive licenses for software we needed.  By the time I left that position, we planned software purchases around the Techsoup cycles.  It has been a valuable program for nonprofits in the United States and in Canada.

SourceForge.net is THE place to look for opensource software projects. As of the last time I checked, it had over 148,000 projects on the go with over 1.5 million users. That's a lot of programming muscle.

Some of the projects ask for donations--PhPMyAdmin is a good example. Some of the projects have become an industry standard--PhPMyAdmin is a good example.

What kinds of software projects can you find on SourceForge?

Entertainment

1. Azeurus--A bittorrent client
2. TONS of free games
3. Video Clients like VLC

Productivity