One-Time Secret - One-Time Secret is a way to share sensitive information simple and secure.
Privnote - Send notes that will self-destruct after being read
Yopass - Yopass is a project for sharing secrets in a quick and secure manner*.
Burn After Reading - A simple, self-hosted pastebin service that uses Tor (.onion) ephemeral links to share encrypted messages and files that are destroyed after they are viewed.
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.
scrt.link - Securely share sensitive information online