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.
On-Screen Ruler - lightweight, free, semi-transparent ruler
Softonic - Softonic is a website that offers downloads for free software and games.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
FileHorse.com - Fast and simple way to download free software for Windows and Mac.
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.