On-Screen Ruler - lightweight, free, semi-transparent ruler
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.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
CNET - CNET is a website that provides you with the latest tech news and tech reviews. The homepage of the website is a huge feed of the latest tech stories that would take you hours to sort through. Read more about CNET.
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.