hidutil is described as 'Command-line utility for remapping keys on macOS Sierra 10.12' and is a Key Mapping tool in the system & hardware category. There are four alternatives to hidutil for Mac and Windows. The best hidutil alternative is AutoHotkey, which is both free and Open Source. Other great apps like hidutil are Karabiner Elements, FNable and Ctrl2Cap.
AutoHotkey is an open-source Windows scripting language for task automation. It crafts scripts for operations like form filling and auto-clicking, initially starting with hotkeys yet evolving into a complete script language. Converts scripts to executables, works offline, and supports debugging.
Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X. In addition to simple key remapping, it has special remapping modes like Emacs-mode, SandS-mode (Space and Shift).
Caps Lock for your fn-key!
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