GrapheneOS - GrapheneOS is an open source privacy and security focused mobile OS with Android app compatibility.
Crypho - End-to-end-encrypted messaging and file sharing
Earlynote - A time-travelling messaging app
Wire by EY - A highly secured collaboration platform
aliceandbob.io - A free, light and easy to use client-side PGP tool 🔐
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.