KeyBindingsEditor is described as 'GUI-based editor for OS X key bindings. It allows for easy editing and supports single-action bindings (one action per keystroke), multi-action bindings (multiple actions for a keystroke) and Emacs meta binding-style multi-keystroke bindings' and is a Key Mapping tool in the os & utilities category. There are more than 10 alternatives to KeyBindingsEditor for Windows, Mac, Android and AutoHotkey. The best KeyBindingsEditor alternative is AutoHotkey, which is both free and Open Source. Other great apps like KeyBindingsEditor are BetterTouchTool, Karabiner Elements, Hammerspoon and KeyTweak.
Very powerful tools but need a longer time to learn how to use.