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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.
You are actually not forced to use XML in C#. You can also use Natural Docs as an alternative.
Speaking of calculators, made this one ages ago, if you have linux can install it: https://github.com/SherabPereira/VSCalculator
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.