Netflow/IPfix Analyzer for network threats and anomalies

I'm evaluating various options for Netflow/IPfix based analyzers which focus on identifying security threats and anomalies. It would be highly appreciated if someone can provide a list of tools with the following points in mind.

  • windows or *nix based .. doesn't matter.
  • proprietary tool or open source ... doesn't matter but open source would be good.
  • price .. doesn't matter.

Thanks


Cisco maintains a nice list of Netflow Software: freeware, commercial, Cisco solutions