Thoses plugins must be copied inside KiCad's python plugins directory (~/.kicad_plugins or /usr/share/kicad/scripting/plugins/ for Linux). Most of them use python ...
A KiCad 9 library for all modern Nordic Semiconductor parts. KLC compliance is established using KiCad's official scripts within the "kicad-library-utils" folder and the "lib_check.sh" script ...