https://www.openhab.org/ https://www.openhab.org/ is a pretty established one (written in Java). Although if you're interested in one that isn't established an

https://www.openhab.org/ https://www.openhab.org/ is a pretty established one (written in Java). Although if you're interested in one that isn't established and is very open to tweaking I've just refactored my home automation system and if other people were interested it would help my motivation to keep working on it (written in Go): https://github.com/alittlebrighter/igor https://github.com/alittlebrighter/igor