Homebridge, IFTTT, SmartThings, Mi Home, openHAB, CoolLED1248, Control4, Domoticz, IP-Symcon, domogik, Switchur, HomeGenie, Stringify, Nim Home Assistant (NimHA), ioBroker, Mozilla WebThings Gateway, FHEM, LinuxMCE, Jeedom, Scrypted, Apilio, SEQUEmatic, DomotiGa, EVA ICS, Freedomotic, HUEston, MisterHouse are some alternatives to Home Assistant.