Lion Tweaks is a popular and powerful tweaking tool for Mac OS X 10.7 and 10.8. It allows you to customize various features of the operating system, such as the user Library folder, dock, system window animation, mail reply animation, Reading List icon in Safari, spelling correction, repeating keys, permanent scrollbars, hidden files, crash dialog pop-up, and a stack list view.
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A free program for Mac, by Pocket Bits LLC.
WindowFinder
