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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.
Goatcounter is another great open source alternative https://www.goatcounter.com
This is actually pretty nice! I'll seriously consider switching from Goatcounter for my site :) (https://devutils.app)
Also see here: https://github.com/ihucos/counter.dev#how-can-it-be-free
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.