PHP

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.

A HTML DOM parser written in PHP5+ that lets you manipulate HTML in a very easy way. Find tags on an HTML page with selectors like jQuery. Supports invalid HTML.

A powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications.

A PHP unit test and web test framework with xUnit style test cases. It has support for SSL, forms, frames, proxies and basic authentication.

A complete PHP templating system that supports creating layouts, blocks, template inheritance, autoescaping, and more useful stuff.

A static caching plugin for WordPress. It generates HTML files that are served directly by Apache without processing comparatively heavy PHP scripts. By using this plugin you will speed up your WordPress site significantly.

Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments.

Fully functional open source email marketing manager for creating, sending, integrating and analysing email campaigns and newsletters. It includes analytics, segmentation, content personalisation, bounce processing, plugin-based architecture, and multiple APIs.

The library provides a Office365 client for PHP applications. It allows to performs CRUD operations againts Office 365 resources via an REST/OData based API.

This is a PHP snippet that shows how to extract the latest additions (What's New) from a MySQL table using PHP.