Choosing animation / simulation tools

[J_Miller]

Hello there,

Like the title suggests, I'd like to make simulations of 'entities' and animate the results in a graphical way.

There will be multiple classes of these entities, each with a graphical representation and with general rules for their behavior and properties.
These characteristics will probably evolve as the simulation goes on.

Some entities will be simple and other more complex, comprised of multiple sub-entities with internal processes going on.
The result of the internal processes may also be displayed inside the entities, with a color or/and numbers.

I played around a bit with netlogo, which is an agent based modeling framework / language. It is sort of what I need but not exactly.
I know there are also tools like matplotlib but those seem to be more adapted to plots and other purely mathematical representations.

I was thinking that some libraries geared toward animating objects in a plane with coordinates would do the trick and maybe also something to generate / animate SVGs.

Any help / suggestions / pointers appreciated.

Thanks