Hello /t/, /tech/ here.
We at /tech/ are building a community on Retroshare. Download it here:
http://retroshare.sourceforge.net/downloads.html
For those who don't know, Retroshare is a private file-sharing platform with social networking features on top (messenging, forums, channels, VoIP etc.). Network is friend-based, you may add friends on the /tech/ thread (https://8ch.net/tech/res/243323.html once you've installed the software, post your public key and add every other one). Traffic goes through several hoops so that everything is anonymized, and everything is of course encrypted. A file-sharing paradise.
There's also a thread on /netplus/ if you want to know more: https://8ch.net/netplus/res/6.html