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manim
A community-maintained Python framework for creating mathematical animations. (by ManimCommunity)
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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.
For the sake of completeness of options, you may also like to check out matplotlib. Here's a related question on SO.
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.