I have this collection of physics links for Haxe. Some are 3D.
Box2D
http://www.joshuagranick.com/blog/2011/10/28/simple-box2d-example-as3-and-haxe-side-by-side
Nape
http://code.google.com/p/nape/
Oimo
https://vujadin.github.io/Away3D_with_OimoPhysics/demo/index.html
Others
http://code.google.com/p/wow-engine-haxe/
http://allanbishop.com/fizzx/