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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.
For example, you can check out the source code of HPM here. There is an HPM folder, which contains the variety of tiles which HPM edits or includes. You can also check out the (granted, a bit limited) modding guide on the wiki.
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.