MagicPad - Free, simple, and private, offline text encryption suite.

Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.

Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.

Keybase Chat - End-to-end encrypted chat built into Keybase

Blur - Blur is a software application available for both Google Chrome and your smartphone. It's developed by Abine, an online privacy company trusted by more than twenty million people. Read more about Blur.

Crypho - End-to-end-encrypted messaging and file sharing