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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.
https://github.com/meirwah/awesome-workflow-engines links to a bunch of open source workflow engines. If you don’t find a tutorial, maybe try one of those and see if the code is small enough to read easily.
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.