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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.
If you want to see some nice (more advanced) uses of generic types, John Sundell's Plot is interesting to study, as he uses this quite frequently. He covers them extensively on his site, including in this post.
NOTE:
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Hence, a higher number means a more popular project.