Domain Specific Languages (DSL Tools) designers, extensions for UML and Layer designers. It also features Code Index build tasks.
By using this SDK, you can build your own graphical or form-based designers.
The SDK is no longer included in the Visual Studio SDK, but does require it to be installed first. The Visualization and Modeling SDK is installed as an overlay of Visual Studio and the VSSDK. It is now a separate install so that it can updated independently