Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Design Systems Repo - A collection of design system examples and resources
ioBroker - flexible and modular application for the IoT and Smarthome
Eva Design System - A free customizable design system
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Ant Design System for Figma - A large library of 2100+ handcrafted UI components