Java Programming

Hi,

For a project I need to simulate a car. I was wondering if any of you guys/gals can suggest (something you have used or know is good) any free s/w framework for discrete event simulation.
I need to research on a few and pick out the most fit for my project (need to write reports and why I picked one of them, etc...).

Please suggest any framework for discrete event simulation in Java or maybe even C# ( if you have worked with it. I know a little, maybe this project can help me learn more).

Thanks.

also, I didnt know exactly where to post this request, so sorry if I posted in wrong forum.