Screencastify - Free screen recorder extension for Chrome. Capture, edit and share screencasts. No software download required. Works on Mac, Windows and Chromebooks. Screen RecorderFree screen recorder for Chrome.

Teampaper Snap - Take a snapshot, highlight key areas and share feedback

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.

Epic Pen - A windows tool for drawing over your desktop and applications

SketchCasts - A weekly screencast, all about how to use Sketch

ppInk - a fork from gInk, with extra features (shape drawings, text,...)