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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.
AlphaVantage (https://www.alphavantage.co/) offer fundamental data as part of their offering. I help maintain a Julia wrapper for the API here https://github.com/ellisvalentiner/AlphaVantage.jl
NOTE:
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Hence, a higher number means a more popular project.