Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
FriendLife - FriendLife is a great and interesting way of making new and dashing friends for free.
Keybase Chat - End-to-end encrypted chat built into Keybase
Twoo - With the millions of active and interesting people around the world, Twoo is one of the most interesting and practical means for finding the new people across the globe.
Crypho - End-to-end-encrypted messaging and file sharing
YEO Messaging - Next generation communication platform, for your eyes only