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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.
Something bespoke.
My code repository contains a link to a youtube channel where the board was discussed, and where I found it randomly. But sadly the upstream site of the provider and the (useful) forums it hosted are gone unless you use the wayback machine:
https://github.com/skx/z80-playground-cpm-fat
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.