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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.
There are some projects where people have designed PCBs for gameboy cartridges, like this one. https://github.com/Gekkio/gb-hardware. The license file says it can be used commercially so you should be good, but I'd read carefully if you plan to sell them.
NOTE:
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Hence, a higher number means a more popular project.