Web-based Traffic and Security Network Traffic Monitoring

FastNetMon - very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support

Network flow analytics (Netflow, sFlow and IPFIX) with the Elastic Stack

Open source components and extensions for nProbe

Flow collector, enricher and visualizer

Enterprise Network Flow Collector (IPFIX, sFlow, Netflow)

pmacct is a small set of multi-purpose passive network monitoring tools [NetFlow IPFIX sFlow libpcap BGP BMP RPKI IGP Streaming Telemetry].

The high-scalability sFlow/NetFlow/IPFIX collector used internally at Cloudflare.

Netflow processing tools

Netflow iptables module for Linux kernel (official)

High performance sFlow/IPFIX/NetFlow Collector

softflowd: A flow-based network traffic analyser capable of Cisco NetFlow data export software.

DynamiteNSM is a free Network Security Monitor developed by Dynamite Analytics to enable network visibility and advanced cyber threat detection

NetMeta is a scalable network observability toolkit optimized for performance.

High-performance NetFlow v5/v9 and IPFIX collector (RFC7011)

Export network flows from Kafka to Prometheus

IPFIXcol is an implementation of an IPFIX (RFC 7011) collector

Lightweight Netflow/IPFIX collector

Manito Networks Flow Analyzer

IPFIX flow exporter with DPDK support capable of bi-directional flows, per-packet-information statistics, and extensibility via processing plugins (e.g., for application layer parsers).