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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.
There are already reimplementations of the client side of some of their protocols (which are just JSON HTTP requests), including account registration without running any JavaScript (parsing the JS is needed though). These are of course against the ToS and can get you banned though.
https://github.com/taylordotfish/harmony/
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.