The 1.8.3 version of QuickLens for Mac is provided as a free download on our website. The application lies within Developer Tools, more precisely Webmaster Tools. The actual developer of this Mac application is PIXELINGENE LLC.
From the developer:
As a UI Designer/Developer, you are always trying to create the best possible interfaces. With QuickLens , you can ensure that your implementation matches the design.
QuickLens allows you to: Zoom in to pixels Measure dimensions Sample colors Inspect alignments
...all through a suite of tools: Lens Ruler Frame Guide Tape Monocle Crosshair
You may want to check out more Mac applications, such as RAGE Domainer, ModelBaker or iGooMap, which might be related to QuickLens.