Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Clever - syncing between education applications for K-12 schools
Keybase Chat - End-to-end encrypted chat built into Keybase
PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Claroline - Claroline is a collaborative eLearning and eWorking platform.