Ramper - Ramper is a free web3 SDK for DApps to onboard users quickly.
Mailinator - Any Inbox. Any Time.
Directual - Low-code for building sophisticated apps
TempMail.altmails - Disposable temporary email addresses
Blockchain Demo - Visual demonstration of blockchain technology
Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.