Planet collisions or proplanetary disk software? (Or any cool physics software)

[Froggy]

Hello, I've been searching for a collision simulator for planets that uses SPH, or a protoplanetary disk simulator. I haven't found any though. US2 doesn't use SPH collisions, and protoplanetary disks are extremely hard to do as rings are slanted. But does anyone know any? (Any cool physics things are also accepted)