QUnit - What is QUnit? QUnit is a powerful, easy-to-use JavaScript unit testing framework. It's used by the jQuery, jQuery UI and jQuery Mobile projects and is capable of testing any generic JavaScript code, including itself!
Device Shots - Generate high-resolution device mockups using a screenshot.
Ava - Making conversations accessible for the deaf
Facebook Design - Devices - Images and Sketch files of popular devices.
Chai - Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.