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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:
The desktops can be installed via Sparky MinimalGUI/CLI iso images (fresh install) or via Sparky APTus → Desktop tab, or via the package manager, alongside of an existing desktop.
Make sure that any issues of the desktops should be reported at the desktop's developer's project sites.