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pmacct
pmacct is a small set of multi-purpose passive network monitoring tools [NetFlow IPFIX sFlow libpcap BGP BMP RPKI IGP Streaming Telemetry].
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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.
https://github.com/pmacct/pmacct is the best exporter I've found. I can pull some old configs for pmacct if you're interested. You can either BGP peer pmacct to FRR to enrich IPFIX with ASNs or you can even instruct pmacct to read prefix to AS mappings from a file.
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.