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Must do the work
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Should encrypt messages from end to end
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Should backed by a reliable group.
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Should be currently alive.
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Preferable when its source code is open.
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Preferable when it supports a serverless architecture such as p2p.
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Hemlis : https://heml.is/
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Threema : https://threema.ch
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Telegram : https://telegram.org/
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Bitmessage : https://bitmessage.org/wiki/Main_Page
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TorChat : https://github.com/prof7bit/TorChat