To show you development with lyneth physics api is ongoing I prepared a little demo scene (of course with some filters on it :) ). The scene contains 30 random shapes.
lyneth is at the moment capable of about 50-60 moving objects with a stable integrator and acceptable performance. Right now I am working on a RK4 integrator (only one so far is Euler) and I already implemented a 20% faster collision detection mechanism which will push the performance to 60-70 movable objects in one scene. Besides that I am planning the editor and working on xml import/export.