Downzen - Downzen.com provides comprehensive reviews and downloads for software in an easy and reliable way.
On-Screen Ruler - lightweight, free, semi-transparent ruler
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Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
FreeFilescr - FreeFilescr is a reviews, education & tech solution website that offers free & premium software and technical guides for windows, mac, and server users to help them in its usage.
Meazure - What are the dimensions of that image? How big is this window?