openHAB

I had my fair share of endeavors with closed and open home automation solutions and this one really hit it off. openHAB is an amazingly flexible center for your smart home, regardless if you are playing around with ESP8266's or driving a whole KNX installation. It's open source and the almost 200 add-ons can talk to nearly everything out there, from Z-Wave over Alexa and IFTTT, your Tesla car and up to whatever you get onto MQTT.
One warning though: "With great power comes great responsibility" ;) openHAB is not a point and shoot adventure. Setting up your SmartHome takes a few minutes but it's totally worth it! Happy Hacking ;)

[Edited by thdietrich86, July 11]

[Edited by thdietrich86, July 11]

Running it on raspbian, powerful and easy to use! Well maintained and free cloud service w/iOS and Android apps.

Brings together nearly any smarthome system on the market, e.g. KNX, Tasmota, various smart devices such as TVs, under one system. Finally a way to automate across technologies.

it's flexible and supports a lot of devices

Stable, well documented, what i need!

Das Projekt ist einmalig und das beste was ich bisher als Heimautomatisierung gesehen habe. Ich habe inzwischen die ganze Wohnung mit esp8266 gepflastert und jede Menge cooler regeln erstellt mit denen das Leben leichter wird .
Macht weiter so !!! Ihr seid die besten !

Simply to install and configure. Excellent architecture with a simple and clear separation between hardware and thing. I developed a setup of Raspberry Pi + Arduino connected over RTU Modbus in few days just with copy past of simple example.