Xfce is a lightweight desktop environment for unix-like operating systems. It aims to be fast and lightweight, while still being visually appealing and easy to use.
Xfce 4.4 (released 2007)
Xfce 4.6 (released 2009)
Xfce 4.12 (released 2015)
To install Xfce including its dependencies (like GTK+), use:
sudo port install xfce
To make Xfce start when X11 is started, add it to your config (make sure you don't have a ~/.xinitrc file):
echo "exec startxfce4" > ~/.xinitrc.d/99-xfce.sh chmod 755 ~/.xinitrc.d/99-xfce.sh
Users of the old X11.app from Tiger will need to do this instead:
echo "exec startxfce4" > ~/.xinitrc
This works and looks best when running XQuartz in full screen mode.
Even better if you install the "Clearlooks" engine and switch themes:
sudo port install gtk-engines2
Put this into your ~/.gtkrc-2.0 file:
gtk-theme-name = "Clearlooks" gtk-icon-theme-name = "Tango"