OpenRemote

evcc

Extensible Electric Vehicle Charge Controller and home energy management system. (Source Code) MIT deb/Docker/Go

Tasmota

Open source firmware for ESP devices. Total local control with quick setup and updates. Control using MQTT, Web UI, HTTP or serial. Automate using timers, rules or scripts. Integration with home automation solutions. (Source Code) GPL-3.0 C/C++

openHAB

Vendor and technology agnostic open source software for home automation. (Source Code) EPL-2.0 Java

FMD Server

A server to communicate with the FMD (Find My Device) Android app, to locate and control your devices. (Source Code, Clients) GPL-3.0 Docker/Go