Sparky offers a few additional desktop environments/window managers which are not available in repositories of Sparky's parent - Debian (some of them already are).
The desktops are available as source code packages hosted by the desktop's developers. They are taken from them, compiled, debianized or re-debianized for end users and placed in the Sparky repositories.
Home roasted 3rd party desktops available is Sparky repos are:
Make sure that any issues of the desktops should be reported at the desktop's developer's project sites.