Collabshot - Free web and desktop application that enables quick screen grabs, easy URL-based sharing, and live, multi-person drawing and sketching.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Flameshot - Powerful yet simple to use screenshot software for Linux.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Nimbus Screenshot - Take screenshots and record video from your screen
LightShot - The fastest way to take a customizable screenshot.