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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 try it out, the source code is available here, and the releases page has signed releases for a bunch of different architectures and platforms. Please be so kind as to file an issue if something does not work, as I don't have a way of testing all of the builds currently.
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.