Simulator Program

Hi there, can any body link me to a nice simulation program written in c/c++ that isn't too huge? It can be anything that involves some sort of a simulation.
I would be very grateful.
Regards,
bump :)
Simulation of what?
Anything at all, anything that involves some sort of a simulation.
Ok...

https://freddie.witherden.org/tools/doublependulum/

Is a simulator for a double pendulum swinging that's written in C++.
Thanks so much Pax for taking the time. I think that program is a little too advanced though. I want something thats only like 1-5 classes big that just compiles on gcc regularly.
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