Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Keybase Chat - End-to-end encrypted chat built into Keybase
Seald - Keep your conversations secure, everywhere.
Hermes - Pandora Client for OS X
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Cyph - Cyph is the name of a completely free chatting website that provides its visitors with a secure and safe chatting environment.