No there’s not. particleView was created as a tool to more easily browse and discover the vast pI3 emitter libraries. Since the new Particle Illusion has the search integrated as well as tagged emitters, larger thumbnails, grid view, etc. there’s no need for an external viewer.
If it’s the full-screen feature that is important to you, we should be able to make it so the existing PI preview window can go full screen (you can almost do it now but there are some frames still showing on a couple of the edges).
Note that you can run PI directly — you don’t need a host app running first.