BeeBEEP is a secure (encryption based on Rijndael Algorithm, AES)
peer to peer office messenger. You can talk and send files with all
your colleagues inside a local area network such of an office, home
or internet cafe without a server. BeeBEEP works also with VPNs.
This serverless application is indispensable in all those places
where privacy and security an essential requirement.

WWW: https://www.beebeep.net/