Nfsight is an open source project that helps administrators gain visibility over their network by automatically listing every new server detected passively within their organization network where flows are collected. The program has two components: a back-end algorithm written in Perl to analyze Netflow data, and a front-end web interface written in PHP to help administrators browsing the server activity.
Downlaod NFsight latest release from here – http://sourceforge.net/projects/nfsight/?source=navbar