Sparky offers a few 3rd party desktop environments, which are NOT available in Debian nor Sparky repositories.
The desktops can be installed, using the desktop's developer's repositories, which are enabled during installation process. The desktops packages are created by the projects holders, what means they can be installed as they are.
Desktops from 3rd party repositories are:
Make sure that any issues of the desktops should be reported at the desktop's developer's project sites.