OpenID - OpenID is a safe, faster and easier way to log in to web sites.
Google Authenticator - Google Authenticator is a multifactor app for mobile devices.
OAuth - OAuth is an open standard for authorization. It allows users to share their private resources (e.g.
andOTP - andOTP is a two-factor authentication App for Android 4.4+
Portier - An email-based, passwordless authentication service that you can host yourself.
Microsoft Authenticator - One app to quickly and securely verify your identity online, for all of your accounts.