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 plugin (Action plugins) in KiCad. This feature is enabled in daily builds of KiCad. See https://forum.kicad.info/t/howto-register-a-python-plugin-inside-pcbnew-tools-menu/5540
A pure python via stiching.
After select "Via Stiching" in Tools menu, choose your options in the interface.
Then the result should be:
