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connectedhomeip
Matter (formerly Project CHIP) creates more connections between more objects, simplifying development for manufacturers and increasing compatibility for consumers, guided by the Connectivity Standards Alliance.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
HomeKit has licensing restrictions that prohibit use of my hardware for certain applications -- unless you pay for some Apple Inc.'s MFi Program. Link.
Repo link https://github.com/project-chip/connectedhomeip
NOTE:
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Hence, a higher number means a more popular project.