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Fathom Analytics
Fathom Lite. Simple, privacy-focused website analytics. Built with Golang & Preact.
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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.
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Plausible Analytics
Simple, open source, lightweight (< 1 KB) and privacy-friendly web analytics alternative to Google Analytics.
Depends on how in-depth you want to go really, I have found https://counter.dev to be fantastic for very basic analytics. And its open source so if you really are so inclined you can run your own instance
Not free, but Fathom Analytics makes a big push towards respecting privacy laws: https://usefathom.com
Check out Plausible (https://plausible.io), they're privacy oriented, open source, self hostable and the developer is quite active and open for discussion on Mastodon