Threema
Swiss encrypted messaging app requiring no phone number or email to register. End-to-end encrypted messages, calls, and groups. One-time purchase of CHF 4.99, with no subscription, no ads, and no data mining. Used by Swiss government and military.
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Threema
Signal
Olvid
Imessage 
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Telegram 
Messenger 
Wechat More European Messaging & chat alternatives
Signal
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Olvid
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Briar
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SimpleX Chat
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Session
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