Foursquare City Guide - Foursquare City Guide is a Free to use mobile application that will lead you to the perfect spot anytime anywhere around the world.
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Flamyngo - Create a city guide with help of your friends.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Sygic Travel Maps - Itinerary planner for independent travelers
Keybase Chat - End-to-end encrypted chat built into Keybase