• http://en.wikipedia.org/wiki/Private_peer-to-peer
• http://en.wikipedia.org/wiki/Distributed_social_network

  
  

• https://github.com/redecentralize/alternative-internet
  • https://github.com/redecentralize/alternative-internet/blob/master/README.md (great list of apps!)
• https://gitorious.org/social/pages/ProjectComparison (great list!)
• https://spreadsheets.google.com/ccc?key=0AtXMsLaocacrdDAwTzdPeGdPNlhZSHFMelg0MnQ2N2c
• http://www.gnunet.org/links/
• http://anonymous-p2p.org/programs.html

  
  

• https://github.com/BitPhone/
• https://bitmessage.org/
• https://github.com/DrDub/thout
• https://code.google.com/p/persevere-framework/
• http://retroshare.sourceforge.net/
  • http://sourceforge.net/blog/retroshare-aims-to-be-a-private-f2f-social-network/
  • http://retroshare.sourceforge.net/wiki/index.php/Completed_Projects
  • http://retroshare.sourceforge.net/wiki/index.php/Started_Projects
  • http://retroshare.sourceforge.net/wiki/index.php/Development
  • http://retroshare.sourceforge.net/wiki/index.php/Todolist
  • http://retroshare.sourceforge.net/wiki/index.php/PaRS11
  • https://retroshareteam.wordpress.com/
  • https://github.com/electron128/RetroShare-Android-Client
  • http://retroshare.sourceforge.net/wiki/index.php/Documentation:Design_overview
• http://www.i2p2.de/
• http://www.gnunet.org/
• http://www.oneswarm.org/
• http://freenetproject.org
  • https://wiki.freenetproject.org/Roadmap/
  • https://wiki.freenetproject.org/Wiki_over_Freenet
• http://buddycloud.org/
• http://dooble.sourceforge.net/
  • http://interface.sourceforge.net/
• http://www.fossil-scm.org/
• http://leechcraft.org/
  • http://wiki.leechcraft.org/wiki/index.php/Roadmap_and_Features
• http://wardcunningham.github.com/
• http://www.tinc-vpn.org/
• https://socialvpn.wordpress.com/
• http://p2pvpn.org/
• https://tahoe-lafs.org/
• http://www.tribler.org/
• http://unhosted.org/
• http://remotestorage.io/
• http://sparkleshare.org/
• http://www.bithorde.org/
• https://silentcircle.com/
• http://projectdanube.org/objectives/
• http://sneer.me/
• http://libreplanet.org/wiki/Group:GNU_Social_P2P
• http://secushare.org/
• https://github.com/jappix/jappix
• http://friendica.com/node/54
  • https://www.youtube.com/watch?v=WSeen1HYxak
• https://github.com/pyofwave/PyOfWave
• http://socknet.net/w/What_is_the_Socknet
• https://code.google.com/p/phantom/
• http://www.waveprotocol.org/federation
• http://kune.ourproject.org/differences-between-loreaelggn-1-and-kuneapache-wave/
• http://yacy.net/
• http://pump.io/
  • http://www.h-online.com/open/news/item/StatusNet-transforms-into-Node-js-driven-pump-io-1771646.html
• http://mediagoblin.org/
• Opera Unite
• FreedomBox Foundation
• http://git-annex.branchable.com/
• https://gitorious.org/lorea/
• https://getsyme.com/
• http://p2pfoundation.net/Category:P2P_Infrastructure
• http://p2pfoundation.net/Category:Technology
• http://sat.goffi.org/
• https://movim.eu/
• https://decentralize.fm/
• http://mempko.com/firestr/firestr.html

Notice: the Jappix project is no longer maintained. We still accept PR (Pull Requests) though. Source: https://github.com/jappix/jappix/blob/master/README.md