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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.
Just a note on the project, despite the name and it's own wording/advertising this is not, by it's common definition, Open Source. It's under the Elastic License. May not matter in most cases for self-hosted but something to consider. Looks like it used to be MIT until earlier this year.
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.