On-Screen Ruler - lightweight, free, semi-transparent ruler
Megaleechers - Megaleechers provides daily news, information and free downloads for trending and high-quality applications
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Filehippo - Filehippo is your key to opening files that Windows claims are "in use by another user" or simply "can't be found." Avoid the hassle.
Meazure - What are the dimensions of that image? How big is this window?
Softonic - Softonic is a website that offers downloads for free software and games.