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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's the source including vector PDF versions for printing and more pages: https://github.com/matplotlib/cheatsheets/
Finplot is in my opinion the best plot library for algo trading in python. It's still in development and definitely worth a try. https://github.com/highfestiva/finplot
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Hence, a higher number means a more popular project.