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.
Aegis Authenticator - Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens...
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.
Google Titan - A 2FA device to protect yourself from hackers
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.