If you are using Maya you can check out Ninja UV. or Ninja Dojo. http://www.creativecrash.com/maya/marketplace/scripts-plugins/texturing/c/ninja-uv--2 http://www.creativecrash.com/maya/marketplace/scripts-plugins/interface-display/c/ninja-dojo-black-belt--2
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 mostly stick to some of the newer tools included in max 2012 and up. With the constant cycle of updates from Autodesk every April I have sort of fallen out of love with 3rd party plug-ins unless they are critical to my workflow and super easy to install and keep updated. Nothing quite like waiting 4 months after max…