Hologram.io - Cellular IoT connectivity that powers innovation
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Bosch IoT Suite - Bosch IoT Suite provides solutions to realize innovative business models in the Internet of Things and cross-domain applications.
ioBroker - flexible and modular application for the IoT and Smarthome
Cisco Jasper Control Center - The world's largest IoT platform now offers greater flexibility to accelerate IoT success for businesses at any stage
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation