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.

Diffuse is a small and simple text merge tool written in Python. With Diffuse, you can easily merge, edit, and review changes to your code.

Git Extensions is the only graphical user interface for Git that allows you control Git without using the commandline. It comes with a manual and video tutorials to get you started quickly.

Skipfish is an active web application security reconnaissance tool. It prepares an interactive sitemap for the targeted site by carrying out a recursive crawl and dictionary-based probes. The resulting map is then annotated with the output from a number of active (but hopefully non-disruptive) security checks. The final report generated by the tool is meant to serve as a foundation for professional web application security assessments.

Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

The Lost Type Co-Op is a Pay-What-You-Want Type foundry, the first of its kind.

A simple, modern and intuitive unit testing framework for PHP!

Test Your Website at Different Screen Resolutions

Online code editor and playground.

A passive reconnaissance tool inside the DOM (experimental)

A super micro tiny DOM library for authoring HTML5 mobile web applications.