Pref Setter has been discontinued. Similar apps include PrefEdit, which has a free version. Other options are PlistEdit Pro, plist Editor, Clover Configurator Pro.app and Mac OS X Prefs Editor. In total there are five apps like Pref Setter for Mac and Windows.
PrefEdit is an application to manage nearly all aspects of the preference system contained in every macOS installation. The program consists of three components which are tightly integrated with each other:
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PlistEdit Pro is the most advanced property list and JSON editor written for OS X. Avoid syntax errors, find and replace, full undo, keyboard navigation, scripting support, and much more.
plist Editor software can open, edit and save .plist file on Windows. It is useful for people who want to customize their iPod Touch or iPhone on a PC.
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Clover-Configurator-Pro - A free Plist Editor with some optional facilities for Clover UEFI boot loader
Edit preferences of any application. Like the 'defaults' command in Terminal.app, but easier to use.
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