Does anyone use or know of any open-source smart home hardware?

I want to create a smart home using completely open-source technology that I can control myself, including hosting and installing everything. I’m having trouble finding open-source smart home devices like window/door sensors and lights. Does anyone know of any open-source options I could purchase? Thanks!

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OpenHAB (short for Open Home Automation Bus) is one of the best-known home automation tools among open-source enthusiasts, with a large user community and quite several supported devices and integrations.

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The Node-Red tool allows you to easily manage behavior and the entire flow of events that are nothing more than, a click on a button