SimplytheBest Google Scripts

A powerful open source PHP library to request a bunch of SEO relevant metrics such as detailed backlink analyses, keyword and traffic statistics, website trends, page authority, Google Pagerank, the Alexa Trafficrank and much more.

A jQuery plugin that provides a full-sized, drag & drop calendar. Fetches events on-the-fly for each month and is easily configured to use your own feed format. An extension is also provided for Google Calendar. It is customizable and exposes hooks for user-triggered events (like clicking or dragging an event).

A PHP client library for accessing Google APIs. The Google API Client Library enables you to work with Google APIs such as Google+, Drive, or YouTube on your server.

Responsive jQuery lightbox plugin suitable for images, inline content, iframes, Google maps, Ajax, Vimeo and YouTube videos.

A PHP class to download website data from Google Webmaster Tools as CSV files.

A framework that takes in the XML file generated by Google Calendar and makes it PHP friendly. There are hooks that allow developers to loop through and generate their own themes outputting the necessary HTML.

A repository of different styles for Google Maps aimed towards web designers and developers.

A free and open-source javascript shopping cart that easily integrates with your current website. It requires jQuery, Prototype or Mootools. Payment can be made using PayPal, Amazon Payments or Google Checkout.