What other p2p software do you use?

[Ryland R. Taylor-Almanza]

Every time I find some new p2p software (my latest discovery being osiris,) I'm amazed at the capabilities of p2p technology! Bitcoin is one of my favorite finds, of course. I want to know what other p2p software you guys use, aside from the common things like bittorrent. Anything interesting I don't know about?

[BTCurious]

This is relevant to my interests. Sorry I don't have anything to add.

[theymos]

I use Tor, though this is not decentralized in the same way as Bitcoin because it relies on central directory servers.

I used to use Freenet and Frost/FMS a lot, but I eventually decided that the discussions aren't good enough to warrant running the extremely heavy software all the time.

I really like the design of GNUnet's network, but I've never been able to get the software to work.