Do you want me to list all 10,000 good Open Source projects, or just the ten I like the most?
Seriously, SourceForge alone has 149,257 projects, and that's probably not even a quarter of all Open Source projects. You've really got to give us more to go on.
Sure, no problems, SwellJoe. What are your personal Top 3 Open Source project sites (like SourceForge)?
Do you mean projects, e.g. Vim, or sites that host projects, "like SourceForge"?