Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Epic Pen - A windows tool for drawing over your desktop and applications
MWSnap - MWSnap is basically a free to use Windows snapping tools that are used for snapping any part of the screen that is currently displaying on the front of all opened programs and windows.
Gromit-MPX - Create annotations by directly drawing on your screen.
FastStone Capture - A powerful, lightweight, yet full-featured screen capture tool that allows you to easily capture...
OBS Studio - Free and open source software for video recording and live streaming for Mac, Windows and Linux.