phpDocumentor enables you to generate documentation from your PHP source code. This documentation provides an in-depth view of your project to you, your consumers and contributors.

Flow is a PHP web application framework focussed on Domain-Driven Design and clean code.

This site provides a collection of schemas that webmasters can use to markup HTML pages in ways recognized by major search providers, and that can also be used for structured data interoperability (e.g. in JSON).

GitLab is a web-based Git repository manager with wiki and issue tracking features. GitLab offers hosted accounts similar to GitHub, but also allows its software to be used on third party servers.

Gate One is an HTML5-powered terminal emulator and SSH client

vfsStream is a stream wrapper for a virtual file system that may be helpful in unit tests to mock the real file system. It can be used with any unit test framework, like PHPUnit or SimpleTest.

A flexible guide to developing sites small and large.

Easily create apps using the web technologies you know and love: HTML, CSS, and JavaScript.
PhoneGap is a free and open source framework that allows you to create mobile apps using standardized web APIs for the platforms you care about.

Put the internet to work for you.

Microsoft provides virtual machine disk images to facilitate website testing in multiple versions of IE, regardless of the host operating system. With a single command, you can have IE6, IE7, IE8, IE9, IE10, IE11 and MSEdge running in separate virtual machines.

Git-flow workflow presentation

So here we're collecting all the shims, fallbacks, and polyfills in order to implant html5 functionality in browsers that don't natively support them.

Teach your forms some manners!

HTML5Forms.js is a JavaScript polyfill that implements a subset of the HTML5
Forms module in all browsers. The script will only add support for the
different parts of the module when there doesn't exist a native
implementation.

Web Forms 2.0 Cross-Browser Implementation

A modern, HTML5-ready alternative to CSS resets

Normalize.css makes browsers render all elements more consistently and in line with modern standards. It precisely targets only the styles that need normalizing.