Tox - The future of online communications.

With the rise of government surveillance programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures full privacy and secure message delivery. Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.

It helps to chat instantly across the globe with Tox's secure messages. It supports Encrypted voice calls, Screen sharing, File sharing, Video calls, Share with group or team. Tox has no central servers that can be raided, shut down, or forced to turn over data — the network is made up of its users.