Flameshot

Flameshot is a cross-platform screenshot tool with a built-in annotation editor. Draw arrows, add text, blur sensitive info, add boxes and circles, and upload directly to Imgur. The interface appears as an overlay on your screenshot. It's free, open-source, and customizable. Assign a global hotkey and capture, annotate, and share in seconds. A Swiss Army knife for anyone who frequently takes and marks up screenshots.