Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

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.

Shutter - Shutter is a feature-rich screenshot program.

Screenity - The most powerful screen recorder & annotation tool for Chrome 🎥 - GitHub - alyssaxuu/screenity: The most powerful screen recorder & annotation tool for Chrome 🎥

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image

EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.