BackstopJS : BackstopJS automates visual regression testing of your responsive web UI by comparing DOM screenshots over time.
Greasemonkey : Greasemonkey is a Firefox extension that allows you to customize the way webpages look and function.
Zed Attack Proxy : The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.
It is designed to be...
The Coach : The coach helps you find performance problems on your web page. Think of the coach as a modern version of YSlow. The coach will give advice of how you...
Hoppscotch : A free, online, open source API request builder
The Web Developer extension adds various web developer tools to a browser. The extension is available for Chrome, Firefox and Opera, and will run on any platform that these browsers support including Windows, OS X and Linux.