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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.
Usually you fit the library to the project, not the project to the library. Just pick something that interests you, maybe even re-do a C++ project in C instead. If you really need ideas, here is a list that can help you.
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.