JR Screen Ruler 

The JR Screen Ruler is a great tool that allows you to accurately measure anything on your screen. This is especially useful when measuring graphics, web page browser sizes or whatever. Screen Ruler can display Pixels, Inches, Picas, Centimeters.
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Adding Three Fractions 

Middle-School (grades 5 through 9) math program written to provide skills in context. Students addone of two types of problems: ruler fractions (halves, fourths, eighths, sixteenths) or regular fractions.
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Reglo 

Reglo is a versatile graphics design tool including an on-screen ruler, a color picker, a magnifier, a mini-screen capture feature, and the ability to resize the windows of other applications.
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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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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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FlipPublisher 

FlipPublisher is an authoring tool for publishing magazines, novels, textbooks, catalogs, brochures, portfolios, manuals, and more as a FlipBook on the Web or on CDs for viewing on a PC.
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