CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.

Robot framework - Robot Framework is a generic test automation framework for acceptance testing and acceptance...

Browsersync - Browsersync makes your tweaking and testing faster by synchronising file changes and interactions...

Selenium - Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.

Ghostlab - Ghostlab allows you to test out a newly developed website on a variety of browsers and mobile devices at the same time. To get started, simply drag the web address to the Ghostlab system and press the play button. Read more about Ghostlab.

Phantomjs - PhantomJS is a headless browser that works hand in hand with Selenium to help developers more efficiently test their sites and apps.