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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.
* There are paid alternatives now, if you want to opt out of what allows them to offer search for "free" then go use those.*
Paying for search won't change the fact that 75% of all web traffic contains Google trackers.
https://whotracks.me/
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.