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softflowd
softflowd: A flow-based network traffic analyser capable of Cisco NetFlow data export software.
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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.
I also saw people using https://github.com/irino/softflowd in order to export NetFlow, could this be a ressource saving alternative?
NOTE:
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Hence, a higher number means a more popular project.