Other software like Universe Sandbox?

[Intelligent@design]

I'm having a problem starting Universe Sandbox that I think is unlikely to get solved until I get a new version of Windows... So, is there other software very similar to Universe Sandbox that has a lot of the same features,  the celestial body simulation and the collision simulator? I would prefer if it is free.

[atomic7732]

GravitySimulator, but the objects aren't 3d or have textures. AstroGrav is very similar but I'm not sure how the textures work or if they change. It's a bit more complex and not as simple to use, and it's also like $60...