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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 the calculations are done in Python, you will need a web host that lets you run a Python interpreter. I don't know of any completely free ones like GH Pages, but paid ones are https://www.pythonanywhere.com/ and https://www.heroku.com/python. Heroku does have a free tier which you could look into, until the site gains more traffic. I am not affiliated with either site.
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.