Early stage of development. Shhhh, go away!
RobiNet is a toy network simulator. I dream of a mix of Scapy (for the simple packet manipulation) with Spirent's Avalanche (for the powerful packet generator).
Written in OCaml so that, if it's not as feature-full as Scapy it won't at least be as slow :-) Performance wise, the goal is some hundreds of hosts.