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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.
If you’re interested in going the other direction to solve the sorts of problems you’re looking at, perhaps you might want to consider something like the Scintilla control? (There was a popular .NET wrapper for it called ScintillaNET, but the author seems to have abandoned it. There’s an actively developed .NET 5.0 fork here: https://github.com/VPKSoft/ScintillaNET)
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.