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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.
I can't read Japanese but translate works ok-ish on OPs linked page but it mentions: https://github.com/elkayem/midi2cv which is what I am basing mine on - or at least the majority of the hardware that's not the microcontroller.
NOTE:
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Hence, a higher number means a more popular project.