http://www.ps3fanboy.com/2008/02/21/gdc08-phyreengine-sonys-new-free-cross-platform-engine/
Was used to make Flow, Fripshift and Dirt.Cross platform, cross api, support for max, maya, collada, docs, samples, game examples and they mention compatibility with Bullet, Havok and PhysX
So on the surface it sounds good, but a lot really depends on how good the tools and libs are, and compatibility doesn't mean much when its C++ anythings pretty much compatible with anything.
Was used to make Flow, Fripshift and Dirt.Cross platform, cross api, support for max, maya, collada, docs, samples, game examples and they mention compatibility with Bullet, Havok and PhysX
So on the surface it sounds good, but a lot really depends on how good the tools and libs are, and compatibility doesn't mean much when its C++ anythings pretty much compatible with anything.