Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Magnet Window Manager - Magnet Developers
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Spectacle App - Move and resize windows with ease.
LightShot - The fastest way to take a customizable screenshot.
Moom - Move your mouse over the green zoom button in any window, and Moom's mouse control overlay will appear (as seen in the above animation).