The main Tuscany project repository is located at https://svn.apache.org/repos/asf/incubator/tuscany. You can use SVN to check out the entire project, and you will get both the java and C++ repositories. Alternatively you can check out just the cpp directory at https://svn.apache.org/repos/asf/incubator/tuscany/cpp, to get the SCA and SDO implementations for C++.
You can find detailed instructions on how to configure the C++ runtime and tools for Linux and Windows.
In order to run the Tuscany C++ runtimes there are some minimum system requirements: