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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.
https://github.com/microsoft/Kuku - this seems to only allow to specify the number of hash functions
https://github.com/efficient/libcuckoo - I'm not so sure about this one as I'm not too familiar with C++
NOTE:
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Hence, a higher number means a more popular project.