Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Startup Toolkit - Interactive how-to guides to launch your startup
ioBroker - flexible and modular application for the IoT and Smarthome
Manager checklist - Cheatsheet of things every manager should do
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Where To Post Your Product - A curated collection of 280+ websites to share your startup