What are some known 2D/3D physics engines for XNA?

Question

I'm looking for a physics engine to use in an XNA project (2D or 3D). Because it's for XNA, it needs to fulfill some requirements:

1. Not necessarily free, but close to it is obviously preferred
2. Managed code only (or it won't run on the 360)

Answer 1

2D

• Velcro Physics is based on box2d but has lot of its own improvements and innovations.
• Box2Dx & Box2D.Xna are both ports of box 2D
• I think theres a port of chipmunk physics out there, but i cant find the link

3D

• JigLib one of the earliest 3d physics engines for xna, been used quite a bit
• Jitter Quite a new engine, but more per formant than JigLib
• Henge3D A newer engine to the scene, impressive multi-threading
• BEPU physics has just recently became free for both commercial and non-commerical use.