Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
Keybase Chat - End-to-end encrypted chat built into Keybase
CallHippo - Easy to use Phone System with World-Class Support
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
KrispCall - Virtual cloud phone system for business