YEO Messaging - Next generation communication platform, for your eyes only
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
LiveKit - The open source platform for real-time communication
Keybase Chat - End-to-end encrypted chat built into Keybase
Path Talk - Smart, Private Messaging
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.