nfsen-ng is described as 'aims to be an in-place replacement for the ageing nfsen'. There are three alternatives to nfsen-ng for Linux, Online / Web-based, Windows and iPhone. The best alternative is NetVizura NetFlow Analyzer. It's not free, so if you're looking for a free alternative, you could try Nfsen or NetFlow Analyzer.
Network traffic monitoring utilizing netflow technology. Helps net admins with bandwidth monitoring, deep network traffic investigation, analyses and reporting. Top talker statistics for devices, interfaces and IP subnets.
NfSen is a graphical web based front end for the nfdump netflow tools that allows you to: .- Display your netflow data: Flows, Packets and Bytes using RRD (Round Robin Database). .- Easily navigate through the netflow data.