RetroShare is probably the only one more or less "finished" right now. There is also a similar one from FSF called GnuNet, and a very Twitter-like alternative c

RetroShare is probably the only one more or less "finished" right now. There is also a similar one from FSF called GnuNet, and a very Twitter-like alternative called Twister, but they are both pretty alpha. If you also want a Skype alternative there's Jitsi, and a new one called Tox, but I haven't looked much into it. I think it's also pretty alpha. http://retroshare.sourceforge.net/ http://retroshare.sourceforge.net/ https://gnunet.org/ https://gnunet.org/ http://twister.net.co/ http://twister.net.co/ https://jitsi.org/ https://jitsi.org/ http://tox.im/en http://tox.im/en For mobile you can take your pick from these: https://missingm.co/2014/02/fighting-dishfire-the-state-of-mobile-cross-platform-encrypted-messaging/ https://missingm.co/2014/02/fighting-dishfire-the-state-of-m...