PicPick - PicPick screen capture software enable you to grab an image on your computer screen, save, print, add effects, and share.
On-Screen Ruler - lightweight, free, semi-transparent ruler
PixelStick - PixelStick is a tool for measuring distances and angles on the screen.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
GizmoLoupe - Simple utility to analyze (with zoom) images of your screen, measure the dimensions of objects on...
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.