Chat Secure
Secure Instant Messaging (Messaging Security) from Guardian Project
was GibberBot
https://guardianproject.info/apps/chatsecure
the biggest difference between Chat Secure and apps like Signal, Telegram, WhatsApp, etc, is that we don't require a phone number to register, and don't need Google Cloud Messaging for push. This means you can use Chat Secure on a clean AOSP device or a Chinese device that doesn't have Google services on it.
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