ScreenTray - A better way to capture, annotate and share screenshots
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Thum.io - A real-time website screenshot generator
Picmaker - Design the Future
Airsketch - Simple screenshots + annotations for Mac 🖥️