Actionscript physics engine which supports particles attracting eachother

Question

I'm looking for a physics engine for Actionscript which supports particles attracting eachother. Like in this example.

So not just objects being attracted by the floor like in most engines (eg. APE afaik doesn't support particles attracting eachother)

Answer 1

Check out the Hype framework. There's loads of attractor, particles, followers, et al. I think you may find something you like regardless ;)

Answer 2

Here are a couple to add to the list:

Fisix Engine

Flade - I don't know if it has the attractor portion but it's still pretty cool. :)