There are several standards in regards to home automation. Reaching back into the Jurassic age there was X-10 which made it possible to connect several devices to a home security monitored (by someone else) system. However it wasn’t very interactive once set up. Coming into the modern age besides Apple’s Homekit there’s Belkin’s Wemo (now discontinued), SmartThings, Ankuoo, D-Link, and TP-Link amongst others.