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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'm surprised no one mentioned OTTO. It's literally a diy op-1 clone... That seems to be just turning into its own cool thing, rather than the original concept of straight cloning the op-1 https://bitfieldaudio.com/
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.