uLogin - uLogin is a convenient service to login via social networks.
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.
GitHub OAuth - OAuth is a protocol that lets external applications request authorization to private details in a user's GitHub account.