Thirding or is it fourthing? Unfold3D. Owns bones. For simple stuff if you're a max person, I still use the microcan UVhelp script. The site is down but I've mirrored it on mine here: http://www.poopinmymouth.com/process/uvHelpV201.mcr
I'm going to resurrect this thread to share what I just found out. Unfold3D was the most suggested UV unwrapping software in this thread, so I looked it up and it looks like it's going to be a native plugin for the imminent Maya 2015. Neat! http://www.polygonal-design.fr/e_unfold/