pixel ruler

Free Ruler is a free screen ruler for Mac OS X.

Perfect Screen Ruler allows you to accurately measure anything on your screen.

Measure objects on your screen with a transparent ruler.

On screen ruler, configurable for horizontal, vertical, centimetres, inches

Perform natural media digital painting with focus on pixel art.

Million Dollar Pixel Script - you can do what you want with this.

24x24 Free Pixel Icons pack will instantly refine your toolbar.

Use this tool to measure anything on your screen (mm, cm,px).

A tool allows you to accurately measure anything on your screen

Measure not only a straight line distance but any curved distance on the Screen