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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.
You may want to have a look at squeal that someone mentioned the other day in the comments of this post.
I also mention https://github.com/circuithub/rel8 on posts like these since I think it should be more well-known.
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.