Kaa - Kaa Enterprise IoT Platform is an end-to-end platform for enterprise-grade IoT, Kaa brings you up to speed with a broad stack of modern IoT technologies and, at the same time, gives you flexibility to adapt it all to your specific business domain.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Mainflux - Mainflux is a secure, scalable, open-source IoT platform written in Go and deployed in Docker.
ioBroker - flexible and modular application for the IoT and Smarthome
ThingSpeak - Open source data platform for the Internet of Things. ThingSpeak Features
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation