LoginTC - Simply Strong Two-Factor Authentication LoginTC is best in class. Effortless Administration. Intuitive User Experience. Cost-effective solution for all organizations.
Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
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.
DIGIPASS - DIGIPASS offers two-factor authentication solutions for mobile applications.
Rapid 2FA - A painless way to add two-factor authentication to your site