Mozilla IoT
https://iot.mozilla.org
https://www.heise.de/developer/meldung/Web-of-Things-ist-offizieller-W3C-Standard-4701801.html
A MicroPython version of webthing-python.
http://microblocks.fun
https://github.com/KrzysztofZurek1973/iot_web_thing_example