Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Responsive Viewer - View multiple screen dimensions in one view
Screenity - The most powerful screen recorder & annotation tool for Chrome 🎥 - GitHub - alyssaxuu/screenity: The most powerful screen recorder & annotation tool for Chrome 🎥
Responsinator - Designed to test responsive websites on different devices.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
Responsive Website Test - Test any website on desktop, mobile, and tablet