StealthChat is an industrial strength chat and phone call app for professionals that value real privacy and security. StealthChat uses advanced end to end encryption to ensure that only the sender and recipient have access to the content of the message or phone call.
SafeNote - Encrypt and send files and notes with a link that automatically destruct after being read. SafeNote is a free web-based service that allows you to share a note or a file with confidentiality. There is no way to spying on you even to a hacker.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Privnote - Send notes that will self-destruct after being read
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Revealit.me - ReveaiIt.me allows you to send a one time link to a self-destructing document.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.