Protonet - Private cloud servers - Slack meets Dropbox in a box
Keybase Chat - End-to-end encrypted chat built into Keybase
Duple - Create your own private cloud at home
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Convox - A year ago, I described a strategy we use to build Convox: Integration over Invention. This philosophy leads us to build a platform that integrates existing cloud services instead of building custom software.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.