Action extensions are separate programs which communicate with IoTool.
Android internal
Arduino
LIFX
Shelly 1
Shelly 1L
Shelly 1PM
Shelly 2.5
Shelly 3EM
Shelly Button1
Shelly Dimmer 2
Shelly Door Window 2
Shelly Duo
Shelly EM
Shelly Flood
Shelly gas CNG
Shelly Gas LPG
Shelly H&T
Shelly i3
Shelly Plug
Shelly Plug S
Shelly Plug US
Shelly RGBW2
Shelly Uni
Shelly Vintage
Your own action