KMonad is a cross-platform, advanced keyboard remapping tool written in Haskell. It provides low-level key control, supporting layers, tap-hold combos, multi-tap, macros, and more—even for keyboards without firmware-level customization.
This is Keyboard layout ScrollLock light indicator for language switching for Windows
ScrollLock LED toggles on language switching
1. ScrollLock LED is off for En-US keyboard layout and on for non-En keyboard layout
2. You can kill program by second launching. You may not use Task Manager
I forked KbLangLED utility to C++