Cryptgeon - Securely share self-destructing notes

1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...

BURN.link - Send secure, encrypted, self-destructing messages

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.

Burner Note - Burner Note is a free, ad-free and open sourced service for sending secure text based notes that are completely erased from existence once they've been read.

Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network