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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.
chatpdf.com often comes up in the comments. It works pretty well, but obviously a chat is limited with the content of a single document, it doesn't match the information. You need an API key to test it. I'm looking for a similar project to host locally, tested many projects but still searching. I tried https://github.com/arc53/docsgpt and got decent results but not enough citation references.
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.