Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Rapid 2FA - A painless way to add two-factor authentication to your site
Hydro Mobile App - Free, instant, scalable, blockchain-based 2FA security
Google Titan - A 2FA device to protect yourself from hackers
Authenticator App by 2Stable - An extra step of security never hurt anybody. Enable two-factor authentication on your online accounts and let Authenticator App by 2Stable do the rest.