[Flowtools | http://www.splintered.net/sw/flow-tools/]
[SiLK | http://silktools.sourceforge.net/]
[nfsen | http://nfsen.sourceforge.net/]
[nfdump | http://nfdump.sourceforge.net/]
[ntop | http://www.ntop.org/]
[ipacco (not really netflow) | http://ipacco.sourceforge.net/index.php]
by