Crypho - End-to-end-encrypted messaging and file sharing
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
blockslack.io - Chat for small teams — encrypted and decentralized
Wire by EY - A highly secured collaboration platform
Messenger Platform - Discovery, chat extensions, and richer experiences
aliceandbob.io - A free, light and easy to use client-side PGP tool 🔐