Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
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...
Weava - Workspace to highlight, organize & collaborate on your research articles.
LightShot - The fastest way to take a customizable screenshot.
Marker.io for Slack - Turn screenshots into Slack messages ✌️