openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
ioBroker - flexible and modular application for the IoT and Smarthome
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
pimatic - Home automation framework that runs on node.js.
Domoticz - Domoticz is a lightweight Home Automation System
Home - Securely control all your HomeKit accessories from your favorite iOS device.