Mac OS X only: Freeware customization utility TinkerTool tweaks hidden settings in all corners of your Mac, from modifying Finder and Dock features and effects to adjusting your system fonts. Similar to previously mentioned system tweaker Onyx, TinkerTool focuses more on visual tweaks in contrast to OnyX’s maintenance-focused tweaks (making them nice companion tools). My favorite feature: the ability to reorganize the order my startup items run via a simple drag and drop. TinkerTool is freeware, Mac OS X only.
I’m do not have a mac but I am trying to include the mac people! 😉 if anyone tries out these programs let me know how they work!!