Losant - Losant makes building connected experiences and solutions easy.
FHEM - FHEM (TM) is a GPL'd perl server for house automation.
Hologram.io - Cellular IoT connectivity that powers innovation
pimatic - Home automation framework that runs on node.js.
Cisco Jasper - Jasper provides a SaaS IoT platform to enable companies of all sizes to launch, manage and monetize IoT services on a global scale.
Homebridge.io - Homebridge is a lightweight NodeJS server you can run on your network that emulates the iOS HomeKit...