Smart Applications REFerence Ontology
ETSI standard reference ontology for smart applications. Extensions for energy, environment, buildings.
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Where this one tends to earn its keep.
Smart home device interoperability
IoT energy management systems
Smart appliance data exchange
Building automation standardization
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in IoT & Sensors.