WebThings Gateway is a self-hosted smart home hub that puts monitoring and control of your whole house in one private web interface, with no vendor cloud in the middle. Lights, plugs, locks, thermostats, and sensors appear as live Things you can watch and operate from any browser, at home or remotely through your own server. Devices from different ecosystems meet here: adapter add-ons bridge a wide range of protocols into a standardized Web of Things API, so gear that never spoke the same language shares one dashboard. A drag and drop rules editor automates the house with if-this-then-that logic, turning motion into light, schedules into climate, and events into actions without code. Sensor history is logged and visualized over time, which makes energy use, temperature drift, and occupancy patterns visible instead of guessed. An interactive floorplan lays devices out on a plan of your home for at-a-glance status and control room by room. Add-ons extend compatibility with more devices and protocols as your setup grows, and everything runs locally, so the house keeps working on your terms and your data stays in the building. It installs from a Docker image and serves its interface over the web from your own hardware. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Mozilla Public License 2.0 licensed.