ShiVa is an AllInOne-solution like gamestudio, but it has no model editor, so you are bound to external model editors that can export to fbx or collada. chek tehir wiki for compatibility.

@daz: gamecore is about to release v2, i strongly recommend to wait for v2 as it has a whole new bunch of stunning features. and if you're a lightwave user, gameCore (formerly beyond virtual) is THE way to go, as it imports lwo directly.