eWeLink CUBE OS is a free self-hosted local system that bridges eWeLink Wi-Fi and multi-brand Zigbee devices into the Matter network for Apple Home, SmartThings, Google Home, Alexa, and Home Assistant.
Originally built into SONOFF iHost, CUBE OS is now available as a standalone system you can install on platforms like Raspberry Pi, virtual machines, and NAS devices.
User Guide:
2. CUBE OS Official Documentation - Standalone Image on Raspberry Pi & Virtual Machines
Videos:
Developer
If you’re a developer and want to make add-ons for CUBE (iHost), refer to this document:
API Document Link