3rd Party Skinning Tools

Skinning Tools

Joe Alter's LBrush

Kickstand Stretchmesh

Discontinued in 2011 and made open source.

Versions here:

https://code.google.com/p/stretchmesh/downloads/list

Efficient elasticity for character skinning with contact and collisions (Disney)

(this isn't a tool that's available per se, but can provide some insight perhaps..)