Hi Ross,
To answer your questions:
1. Yes, you can find example files on the download pages, here's links for Body v1 and v2:
2. Yes, all the software comes with custom developed filters specifically designed for filterering body/face data.
You can view the results in realtime in the viewport (and network streams), filtering parameters can be adjusted and they can be turned off in case you'd rather do that in your favorite 3D animation application.
3. For recorded files you usually simply load them as FBX files in your favorite 3D animation application, do retargeting, motion editing etc and export to Unity as usual.
For realtime streaming the C# script comes in, which handles all the difficult networking stuff and applies the rotational data to an example skeleton.
4. PDF documentation is included witht the installers, you can also download them separately from the links in question 1
5. No, except for the Unity scripts/shaders this is not open source software.
Btw, if you want me to set you up with a full evaluation version just drop me a personal email with which apps/versions you want to test.
Greets,