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Is there a software for OS-X that will do all those tasks? Finding screen-coordinates (x,y), the pixel color below pointer, and distance between 2 points?

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See also Utilities for finding x/y screen coordinates. – slothbear Dec 25 '12 at 4:47
    

You can show screen coordinates if you start taking a screenshot by pressing ⇧⌘4:

You can also use it to measure the width and height of areas:

To abuse bundled applications even further, it's easy to get the diagonal in AppleScript Editor:

(114 ^ 2 + 89 ^ 2) ^ 0.5

You can see the color of pixels with DigitalColor Meter:

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You don't have to fire up AppleScript Editor to perform a calculation like that. Spotlight will do it for you too. – slothbear Dec 25 '12 at 4:50

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