Seald - Keep your conversations secure, everywhere.
Hermes - Pandora Client for OS X
Keybase Chat - End-to-end encrypted chat built into Keybase
Pithos - pithos is a daemon which provides an S3-compatible frontend for storing files in a Cassandra cluster.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Crypho - End-to-end-encrypted messaging and file sharing