ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Sketch - Professional digital design for Mac.
LightShot - The fastest way to take a customizable screenshot.
Affinity Designer - Professional creative software, exclusively for Mac.