Google Sign-In - Google Sign-In is a secure authentication system that enables users to sign in with their Google accounts.
Facebook Login - Facebook Login is a secure, fast and convenient way for people to log into your app or website.
InstaDp.info - With InstaDp you can view instagram profile picture for free in full(original) size and download it right away.
LinkedIn Login - LinkedIn Login is an authentication solution that lets users sign in with their professional identity.
Reddit Login - OAuth2 support allows you to use Reddit to authenticate on non-reddit websites and applications.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.