5 reasons to delete WhatsApp immediately, which does not respect your security and privacy! And how to delete an account in 5 easy steps.
Comparison of messaging and VOIP services: Signal vs Telegram vs Threema vs Wickr vs Wire vs Element vs Keybase vs twinme
Looking for a free, anonymous (no phone number needed), encrypted app, for making voice/video calls and messenging
Wickr me is a real anonymous and fully-encrypted messaging and Voice over IP, contrary to Signal which is not anonymous.