The attached package is a pair of MilkShape plugins for working with Sims 3 body meshes. This version requires MilkShape 1.8.5, due to TS3 specific requirements. You can get the update directly from the publisher at http://chumbalum.swissquake.ch/index.html. Note that while the update is free to registered users, MilkShape 3D is not a free package.
The plugins also require the "Visual Studio 2008 Runtime" package be installed. This is free from MicroSoft, and can be found here.
With these two prerequisites, you can download and use the plugins freely, provided you adhere to the licensing terms, which no longer restrict what you make with the plugins (included in the package).
They are much like UniMesh for TS2, although they are fundamentally different because TS3 is fundamentally different. Included in the archive is a new plugin, the CCTool, which allows editing some new TS3 specific values, the VertexID and the TagVal.