Although designed with the GNOME desktop environment in mind, Font Manager (for Linux) should work well with most major desktop environments such as XFCE, Enlightenment, and even KDE, as long as PyGTK is available.
You have used GNOME and KDE, but have you ever tried Enlightenment? If not, give it a try and I am sure you won’t regret. Enlightenment, also known simply as E, is a lightweight desktop manager for Linux which can be used alone or in conjunction with GNOME/KDE.
Many Linux distributions try to be visually appealing. Some use Beryl-Compiz for cool 3-D effects on resource-laden boxes, while others turn to desktops like Enligtenment for a little bit of gloss at the expense of functionality. Geubuntu is a new distro that combines the best of those two worlds, equipping Enlightenment with bits from GNOME and Xfce on top of Ubuntu.