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https://developers.google.com/drive/examples/php DrEdit PHP is a sample Google Drive app for the Google Drive SDK written in PHP. It is a text editor capable of editing files with the MIME types text/* and extensions such as .txt , .html , .csv , .xml , etc. that are stored in a user's Google Drive.

Drive SDK

https://developers.google.com/feed/v1/jsondevguide You can use the Google Feed JSON interface to write feed applications in any language that can handle a JSON -encoded result set with embedded status codes.

JSON Developer's Guide for the Google Feed API - Google Feed API

Google Feed API - JavaScript Reference

https://developers.google.com/feed/v1/reference Table of Contents Google Feed API JavaScript reference Constructor
Google Documents API Google Calendar API Google Spreadsheet API Blogger API Contacts API Google Data Authentication The new Force.com Toolkit for Google Data APIs makes it easy to develop Force.com applications that make the most of the capabilities of Google Data APIs, including read and write access to data and content in Google Apps. The toolkit provides you direct access to the Google Data APIs from Force.com's Apex code, allowing the easy creation of new user experiences and Web applications that connect directly to Force.com’s database, integration, Apex programming language, and Visualforce user interface capabilities.

Google Data API Toolkit

http://wiki.developerforce.com/page/Google_Data_API_Toolkit
You can embed a simple map, a set of driving directions, a local search, or My Maps created by other users. Here's how: http://support.google.com/maps/bin/answer.py?hl=en&answer=72644

Embedding a map into a website or blog - Maps Help

General

Google API loader allows you to easily import one or more APIs, and specify additional settings (such as language, location, API version, etc.) applicable to your needs. https://developers.google.com/loader/

Google Loader Developer's Guide

http://framework.zend.com/manual/1.12/en/zend.gdata.spreadsheets.html The Google Spreadsheets data API allows client applications to view and update Spreadsheets content in the form of Google data API feeds.

Google Spreadsheets - Zend

Google Contacts

Picasa API

https://developers.google.com/google-apps/documents-list/ Important: Version 3 of the Google Documents List API has been officially deprecated as of September 14, 2012. It will continue to work as per our deprecation policy , but we encourage you to move to the Google Drive API . The Google Documents List API allows client applications to view and manipulate files in a user's Documents List.

Google Documents List API

Gmail API's

https://developers.google.com/google-apps/gmail/ The following APIs will help you and your users interact with, configure, and extend Gmail. Gadgets
Google Forms