[swinog] Graphical NetFlow AS stats tool?

Hello,

does anybody on this list know of a free/open source tool that collects NetFlow AS aggregation records from a number of routers and produces traffic graphs per AS that show how much traffic came in from or went out to a given AS, and over which link (-> multiple upstreams/peering links)?

I'm asking because I've made something like that on a whim for Monzoon Networks to help with BGP traffic engineering, and would be happy to polish it up a bit and then release it, but if the solution is already out there (and better than what I've come up with ;), I wouldn't bother.

Cheers,

Manuel