Canned Emails - A minimal site with prewritten emails
Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
analyze.email - Test the spam-y-ness of your emails
Rapid 2FA - A painless way to add two-factor authentication to your site
TapText - Send canned text messages with a single tap
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type