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A free .NET open-source enterprise service bus.
Once you have downloaded the source you need to initialize your environment by executing the initialize-environment.msbuild file.
Open a Visual Studio Command Prompt
cd {extract-folder}\build\{relevant-version}\
msbuild initialize-environment.msbuild
You will be prompted for your sql data source. If you wish to keep the default (.\sqlexpress) or you you would want to check this out later simply press enter.
This makes changes w.r.t. the paths in some pertinent files will also call an msbuild task for complete-build.debug.msbuild to build the debug development environment.