PlistEdit Pro - PlistEdit Pro is the most advanced property list and JSON editor written for macOS.
Clover Configurator Pro.app - Free Plist Editor on macOS
Pref Setter - Pref Setter is an application for Mac OS X used to edit property list files.
Filza File Manager - Explore files and folders with list view or grid view. View / edit files with powerful viewers.
Mac OS X Prefs Editor - Edit preferences of any application. Like the 'defaults' command in Terminal.
Eddie - Eddie is a programmers editor for Mac OSX and Gnome Linux.