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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.
A bigger one is here https://github.com/MengtingWan/goodreads
I believe there is a popular 6 million rating one but not 6 million users. I used that one to make my first book recommender https://github.com/Santosh-Gupta/Lit2Vec
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.