One-Time Secret - One-Time Secret is a way to share sensitive information simple and secure.
Cryptgeon - Securely share self-destructing notes
Password.link - Securely send and receive secrets using a one-time link. The secret is encrypted and decrypted in the browser using an encryption key only known by the user. Has features like notifications, teams, API. Trusted by IT teams all around the world.
BURN.link - Send secure, encrypted, self-destructing messages
Revealit.me - ReveaiIt.me allows you to send a one time link to a self-destructing document.
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.