This project contains sample code for using OAuth 2.0 with Gmail. The code here focuses on using OAuth credentials to connect to Gmail. There is much more sample code available, including examples of obtaining and authorizing OAuth credentials, in the Google APIs Client Libraries.

OAuth2DotPyRunThrough gives a quick run through of using the Python sample code to generate and authorize OAuth 2.0 credentials, and to use them to connect to Gmail.

JavaSampleCode describes the Java sample code for connecting to Gmail with OAuth 2.0 credentials.

PhpSampleCode describes the PHP sample code for connecting to Gmail with OAuth 2.0 credentials.