Bitcoin related P2P distributed web/twitter/search enginer/chat

https://www.changetip.com/
http://antigate.com/?action=api
https://bitmessage.org/wiki/Proof_of_work
https://news.ycombinator.com/item?id=9127033
http://maidsafe.net/
https://github.com/ethereum
http://yacy.net/en/index.html
https://github.com/HelloZeroNet/ZeroNet
https://github.com/irungentoo/toxcore
https://github.com/miguelfreitas/twister-core

give them a try!