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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.
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It's all audio focused, but mutable instruments modules are all open sourced with hardware designs as well here: https://github.com/pichenettes/eurorack
Use the code search on github! If you are looking for a "real" products firmware, the Flipper Zero is an actual product that has been popular recently.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.