ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Google Sign-In - Google Sign-In is a secure authentication system that enables users to sign in with their Google accounts.
Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.
uLogin - uLogin is a convenient service to login via social networks.
Keygen - A dead-simple software licensing API built for developers
Facebook Login - Facebook Login is a secure, fast and convenient way for people to log into your app or website.