Well, since Vue saves to most standard image formats, any program that can import those stadard formats can use a Vue scene. I mean, I do background images in Vue all the time that I then import to Poser as a JPG. Animations done in Vue can go out as straight AVI files that also can be imported into Poser.

But if you want to save objects you've made in Vue, you need to buy an export extension from E-on because I haven't found any system that uses the .vob format, other than Vue itself.