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Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
PMeter - PMeter is a very handy pixel meter.
Meazure - What are the dimensions of that image? How big is this window?
Pixus - Pixus is an AIR pixel ruler application, a handy tool for web and interface designers.
KRuler - KRuler is a screen ruler tool for measuring the size, in pixels, of items on the screen.
ScreenRuler - ScreenRuler lets you measure objects on your Ubuntu desktop using six different metrics.