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

Dxtory - Tool to display FPS in video games, make screenshots, record videos.

ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...

Droplr - Droplr is a tiny application that aims at helping people share things easier.

LightShot - The fastest way to take a customizable screenshot.

ConnectWise Control - ConnectWise Control is a mobile app that allows you to instantly connect with another system from anywhere with a connection to the internet. The software not only comes in a mobile app, but it has a desktop version as well for complete coverage.