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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.
On-Screen Ruler - lightweight, free, semi-transparent ruler
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Meazure - What are the dimensions of that image? How big is this window?
LightShot - The fastest way to take a customizable screenshot.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.