Instead of looking at web comics like I was going to, I spent a fair bit of time last night going through the Source Forge listings. And I found some great stuff!
The list of Categories looks interesting -- I've already downloaded copies of Hugin (panorama maker) -- but I was really interesting in the List of open source games. Xconq looks interesting (I used to play EMPIRE and EMPIRE DELUXE a lot) as does XEvil (excessive violence guaranteed).