> Freenet is a distributed data storage network designed to prevent censorship, provide anonymity and be hard to block.

A very similar solution offering this is http://retroshare.sourceforge.net/

You get decentralized/p2p encrypted VOIP/chat/messaging/file sharing (written in C++).

General intro for "darknet" solutions: https://en.wikipedia.org/wiki/Darknet_%28file_sharing%29