Here are some representative screenshots on FreeBSD 5.1 with the Enlightenment window manager and a few transparent aterms.
Xplanet is free software, distributed according to the terms of the GNU General Public License.
I've compiled and run Xplanet successfully on i386 GNU/Linux systems, Sparc Solaris, FreeBSD, and Microsoft Windows under the Cygwin environment. Xplanet runs under Darwin and X windows as well as under Mac OS X with Aqua.
If you find any bugs or have any comments, please visit the Discussion Forums.