On-Screen Ruler - lightweight, free, semi-transparent ruler
Img.vision - Image hosting & video hosting for eCommerce sellers
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
UploadHouse - Thumbnail and resize your photos and images
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.
BeeIMG - BeeIMG is a simple, fast, easy image sharing solution created to fill up your image sharing needs.