GhostBSD
GhostBSD is a user-friendly desktop operating system based on FreeBSD. Its default desktop is MATE, but a separate community edition with Xfce is available too.
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Q4OS
Q4OS is a Debian-based desktop Linux distribution offering a choice of a classic-style user interface (Trinity) and a modern desktop environment (KDE Plasma). The project also develops various utilities, such as Desktop Profiler and Software Center, as well as installers for third-party applications.