Knock Knock is a free and Ruby based Google Authentication API tool that will ease up the login process.

NOTE: Knock Knock is distributed and licensed under the terms of the MIT/X Consortium License.

Here are some key features of "Knock Knock":

· Singleton class for connection with Google
· Simple authentication and clear code
· GET, POST, PUT, DELETE method implemented
· Connection with any Google Account, even Hosted Google Accounts