Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Keybase Chat - End-to-end encrypted chat built into Keybase
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .