Proxying NetFlow traffic correctly

[Sami via NANOG <nanog () nanog org>]

Hello,
I have been searching for a solution that collects/duplicates NetFlow traffic properly for a while but i couldn't find 
any.
Do you know any good unix alternative to ntopng, flowd, flow-tools?

nprobe of netflow seems to be the closest one to fit my needs but i want to see if there are any other solution.

My goal is to centralize NetFlow traffic into a single machine and then proxy some flows to other destinations for 
further analysis

Best Regards,
Sami