AppThwack tests Android, iOS, and web apps on real devices

needle Needle is a tool for automated testing CSS with Selenium and nose.

Mocha - the fun, simple, flexible JavaScript test framework Used at the Team Custom Lisbon Meetup in 2014

Jasmine: Behavior-Driven JavaScript Recommended by Christoph Burgmer at CSSConf 2014

Huddle/PhantomCSS Visual/CSS regression testing with PhantomJS

BBC-News/wraith responsive screenshot comparison tool by the BBC

CasperJS, a navigation scripting and testing utility for PhantomJS and SlimerJS open source navigation scripting & testing utility written in Javascript

Selenium - Web Browser Automation automates browsers

Type-o-matic A browser extension by Nicole Sullivan that finds all the fonts on a page

Invision App - Web & Mobile Mockup and UI Prototyping Tool Recommended by Josh Stewart & John Ford