openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
RipplesIoT - Ripples provide wireless inventory tracking and asset monitoring solutions on the cloud for manufacturing, warehousing, construction, and healthcare industries.
ioBroker - flexible and modular application for the IoT and Smarthome
The Thing System - The Thing System is an open source IoT platform.
Domoticz - Domoticz is a lightweight Home Automation System
Homebridge.io - Homebridge is a lightweight NodeJS server you can run on your network that emulates the iOS HomeKit...