Zatar - IoT Analytics
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Azure Stream Analytics - Azure Stream Analytics offers real-time stream processing in the cloud.
ioBroker - flexible and modular application for the IoT and Smarthome
AWS IoT Analytics - IoT Management
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation