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

Lightweight Netflow/IPFIX collector

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

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).

Testbed for testing NetFlow/IPFIX network monitoring probes. Includes tools for PCAP generation and replay of 1/10/100G network traffic.

Flow Data Storage library

Stores IPFIX (NetFlow version 10), NetFlow v9 and NetFlow v5 data in a database - it is a collector

Vermont (VERsatile MONitoring Toolkit) is a modular network monitoring toolkit. Its main purpose is the processing of network flow data (as exporter and collector). With the help of Ntop's Pf_ring library it can handle packet rates up to 10Gbit/s.