Gather Town - Spatial video-chat worlds for work and play
Keybase Chat - End-to-end encrypted chat built into Keybase
VRChat - Create and play in virtual worlds with others
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Topia - Create amazing wallpapers for your iPhone
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.