Autoweight - Automatic skinning tool for 3ds Max 0.03
via. Scriptspot.com
Autoweight is a script designed for 3D Studio Max 2010 and higher helping you speeding up the skinning process of characters and machines.
You define special polygon regions and the script finds the appropriate bones, calculates the appropriate skin-vertices and sets up smooth transitions between those regions.
There is also a Youtube-video tutorial explaining the script step-by-step.
To install it just drag the mzp-file into your viewport. If Max says "Autoweight was successfully installed" you'll find "Kogen's Tools" in your "Costumize user interface" category where you'll find "Autoweight".
Kind regards
ko'gen