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Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Clerk Chat - SMS for Slack
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Instashot - Access text from any image instantly.
LightShot - The fastest way to take a customizable screenshot.
Annotate by Convergely - Easily annotate images you get on Slack - just like Skitch