The last piece of the Service Platform is our hands and feet (remember our human body metaphor?)—it allows us to build things and move quickly. In other words, ServiceMatrix is a graphical tool that helps us prototype and build NServiceBus systems quickly.
ServiceMatrix should have been installed in Visual Studio when you installed the Service Platform. If not, it can be installed separately from http://particular.net/downloads or directly within Visual Studio from the Extensions and Updates dialog in the Tools menu. Note that there are different versions of ServiceMatrix for Visual Studio 2012 and 2013, so make sure you install the correct one for your version.
To get started, open Visual Studio and create a new project, selecting the NServiceBus v5 System template under the Visual C# category.