FHEM - FHEM (TM) is a GPL'd perl server for house automation.
pimatic - Home automation framework that runs on node.js.
Homebridge.io - Homebridge is a lightweight NodeJS server you can run on your network that emulates the iOS HomeKit...
Control4 - Control4 manufactures a complete line of affordable wired and wireless smart home systems and home...
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
SiteWhere.io - The Open Platform for the Internet of Things