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And there's http://retroshare.sourceforge.net/

- 100% decentralized/p2p (no central server)

- (public key) encrypted

- open-source

- does: file sharing, "emailing", chat, VoIP, forums, etc.

it is impossible to setup and use without deciphering thirdparty guides. and even then it is awkward and painful to use. I wish they would restart with a useable GUI and highly limited but well working feature set.

I'm very surprised by your comment. I'm using it on Ubuntu, my family is still on Macs but uses it too. Everybody without the slightest issue. Install was as easy as any other program (Ubuntu and Mac). True, the UI could be more polished, but it's the tech behind that's interesting when you're interested in privacy.

It has tons of dependencies though.

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