One-Time Secret - One-Time Secret is a way to share sensitive information simple and secure.
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.
Password Pusher - Go Ahead. Email Another Password.
1ty.me - If you need to send a password or some other form of simple but sensitive information to someone...
Yopass - Yopass is a project for sharing secrets in a quick and secure manner*.
nohistory.fyi - nohistory.fyi is free to use webservice to share secret messages in a secure way.