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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.
check out https://github.com/ossu/math if it will be useful for you.
www.khanacademy.org + www.codecademy.com
Just start https://github.com/ForrestKnight/open-source-cs just search the GitHub page for math
NOTE:
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Hence, a higher number means a more popular project.