Zabbix - Track, record, alert and visualize performance and availability of IT resources
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
ioBroker - flexible and modular application for the IoT and Smarthome
Prometheus - An open-source systems monitoring and alerting toolkit.
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation