CoverMe - Private texting, calling, vault
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Messenger Platform - Discovery, chat extensions, and richer experiences
Keybase Chat - End-to-end encrypted chat built into Keybase
Facebook Messenger Kids - Safer and More Fun Video Calls and Messaging
Crypho - End-to-end-encrypted messaging and file sharing