Softimage has release version 1.5 of Softimage|Behavior, which allows you to simulate the behavior of crowds consisting of hundreds or thousands.
The program consists of an IDE and SDK, while new in version 1.5 is a batch processing model that can be used to model complex behaviors in the background, so that you can keep using your workstation while calculating the last simulation.
The program lists for $14,995, which includes one license (additional licenses are $1,995 each).
