Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
PlistEdit Pro - PlistEdit Pro is the most advanced property list and JSON editor written for macOS.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
plist Editor - Reads and writes both text and binary .plist files.
Notepadqq - Notepadqq is a linux clone (identical application) of Notepad++
Pref Setter - Pref Setter is an application for Mac OS X used to edit property list files.