Airsketch - Simple screenshots + annotations for Mac 🖥️
Epic Pen - A windows tool for drawing over your desktop and applications
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Gromit-MPX - Create annotations by directly drawing on your screen.
Evernote Web Clipper - Clip, don't bookmark. Web Clipper is a browser extension that lets you save any web page, article, or image into Evernote. Download now.
Ardesia - Ardesia is an usefull software for use your desktop as a Sketchpad.