This is one of those ideas that make you wonder why nobody has thought of it yet! Copy 3D data from one app, and paste it straight into another.
Oliver Hotz has created an open source tool that will allow you to copy and paste geometry between 3D applications. Not only geometry but surface/material names, SubDs, weight maps, UV maps....
There is support for Blender, Houdini, lightwave, Modo 3dsMax Sketchup Rhino and Maya. He's made it open source and is hoping it will be improved upon. You can see what apps and what each supports at github.
Lightwave > Blender > Houdini and back to Lightwave
3dsMax > Blender back to 3dsMax
(please note the 3dsMax version is w.i.p. so there's a few work around to be done currently)
Lightwave to Modo demo video