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by johnisgood 1639 days ago
RetroShare is pretty cool. Initial release was in 2006.

> Retroshare is a free and open-source peer-to-peer communication and file sharing app based on a friend-to-friend network built on GNU Privacy Guard. Optionally, peers may communicate certificates and IP addresses to and from their friends.

> RetroShare is a decentralized, private, secure, cross-platform, communication toolkit. RetroShare provides file sharing, chat, messages, forums, channels and more.