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TinkerTool

In the beginning (of OS X), users had to use the command line to apply various system tweaks. Then came TinkerTool. This simple preference pane allows you to easily tweak things like the zoom rectangle effect, showing hidden and system files in the Finder, disabling arrows on aliases, using transparent icons in the dock, adding a new minimization effect to the dock, adding double scroll arrows to scrollbars, and a number of other such features.