Mac PDF Measure It 

Mac PDF Measure It is an Acrobat plug-in tool, it enables accurate measurement of the distance and angle between two points on a page. To measure a distance, click anywhere on a PDF page to set a reference point.
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PDF Measure It 

accurate measurement of the distance and angle between two points on a PDF page
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Abilities Builder Measure It 

Build linear measurement skills, with English and metric rulers. This multimedia program uses the Microsoft Agent Peedy, a parrot character. Printed worksheets and tests can also be generated.
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Pixel Port 

Pixel Port is a magnifier, an eight-way color picker, a ruler, and a protractor. All features reside on a single compact floating palette.
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GAX Professional 

GAX is a powerful application for web designers, graphic designers and everyone else who works with graphics. It contains a colorpicker, a screen ruler, and a screen capture tool.
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Screen Calipers Mac Edition 

Version 3.2 of Iconico.com's popular design software offers great new features to accurately and effectively measure anything on a computer screen with pixel perfect accuracy. The Screen Calipers are for the first time available the Apple Mac.
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