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openreplay
Session replay and analytics tool you can self-host. Ideal for reproducing issues, co-browsing with users and optimizing your product.
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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.
OpenReplay are in this space, but beware they are not, as they claim, Open Source (As per the common definition), just Source Available. I have recently raised this with them. Might or might not be an issue depending on your use, check the limitations in their license to be sure.
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.