List of the ‘scope’ options available when requesting OAuth tokens for accessing Google APIs
#gdata
Google API Directory
Complete listing of Google services with APIs, linking to developer guides, client libraries and references where available.
PHP 4/5 class library for Google Data APIs
PHP 4/5 class library for Google Data APIs
Handles AuthSub, requests, etc. Includes a sample application that the developer built for working with GCal.