Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Snagit - Screen Capture Software for Windows and Mac
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
LightShot - The fastest way to take a customizable screenshot.
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.
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