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Chadder - Encrypted messaging app
Seald - Keep your conversations secure, everywhere.
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
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.