openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
DeltaSalesApp - Field Sales Force Automation & Field Force Tracking Software
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Smart Service - Smart Service's QuickBooks integration makes it the ultimate scheduling and dispatch software for HVAC, plumbing, pest control, and other service industries.
ioBroker - flexible and modular application for the IoT and Smarthome
Service Cloud Field Service - Service Cloud Field Service is a cloud-based field service solution designed to initiate customer service activities from anywhere.