BizTalk Software Factory for BizTalk Server 2013.
Similar to previous versions, no additional functionality. Support for BizUnit has been discontinued for schemas and maps, because the project seems no longer maintained. Some new out-of-the-box test functionality has been added. For orchestration unit tests however, still BizUnit sample code is there.
This version also depends on the Visual Studio 2012 SDK, so install it first:
Since Microsoft dropped support for GAT and GAX, the community version Open GAT/GAX is used.
Install from http://opengax.codeplex.com/
If you like the BizTalk Deployment Framework, it is supported in this version as well. Make sure you install v5.1 beta for BizTalk server 2013.
There is one known issue so far. When the package is installed, two guidance packages show up in the create project dialog. One for the BSF and one for the template unit test project that it uses. I haven't found a way yet to make sure it doesn't show up.