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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.
Here are some other options that are free: - SymPi - AlgebraJS - JuliaNLSolve
For something persistent, you can use e.g. Google Colab for free if you don't need a lot of compute. There are also a ton of other commercial offerings like that with a free tier.
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.