Chadder - Encrypted messaging app
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
Keybase Chat - End-to-end encrypted chat built into Keybase
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Confide - On the off chance that you need to get your messages private and encoded then utilize Confide that will fill in as your own and classified courier.