KCometen3 is a popular KDE screensaver hosted on KDE-look.org. QCometen3 is a port of it to to Qt4. It doesn't depend on any KDE version, but should work in both KDE3 and KDE4. With some tinkering, it may work in Xscreensaver and gnome-screensaver too.
Unfortunately, QCometen3 doesn't come with a setup dialog. However, if you used KCometen3 before, QCometen3 can read its config files. If not, you'll have to create a config file in ~/.config/QCometen3.conf manually. (See default values at the bottom of the README.)
KCometen3 is by Peter Mueller . It was ported to Qt4 by Tomi Belan .