Yeemp is an encrypted messaging system, currently (September 2013) in active development. The short-term goal is a secure, private, open-source videophone application. It should be considered highly experimental at the moment - the protocol is not finalized.
Current status: the command-line client and server both work; the server routes messages, and the clients can exchange key requests, text messages, and files. I'm working on video streams (I can currently get Yeemp clients to send video to each other, but I haven't yet gotten the latency down to acceptable levels - and I haven't yet started audio support.
Privacy.
(expansion pending)
(expansion pending)