MagicPad - Free, simple, and private, offline text encryption suite.
Cryptgeon - Securely share self-destructing notes
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
BURN.link - Send secure, encrypted, self-destructing messages
Blur - Blur is a software application available for both Google Chrome and your smartphone. It's developed by Abine, an online privacy company trusted by more than twenty million people. Read more about Blur.
1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...