Ask HN: P2P Projects Worthy of Allocating Server Resources To?

Hi, I'm aware of Tor, & don't want to get involved in all the negativity that comes from running it on my own IP address. What other P2P projects exist which do something for the common good? The box I have in mind isn't Debian, so Freedombox isn't feasible. And it seems the distributed computing/storage projects out there aren't mature enough to even install- (Maidsafe, Storj). I already have another GUI'ified server running Bitcoin, Litecoin, Namecoin, & BitShares nodes. They don't use so much power- just a bunch of memory. What I'm looking for now would run on a headless server. What else is there that I could contribute bandwidth & cycles to?