Xscreensaver is a modular screen saver and locker for x11, containing more than 200 screen savers.
this package contains a small selection of graphical screen saver modules (listed below) from the xscreensaver collection. this package is used by both xscreensaver and gnome-screensaver.
this is the selected set of non-gl screensavers shipped by default: abstractile, binaryring, cwaves, deco, distort, fiberlamp, fuzzyflakes, galaxy, hexadrop, m6502, metaballs, penrose, ripples, shadebobs, slidescreen, swirl, tessellimage, xlyap.
more display modes can be found in xscreensaver-data-extra, xscreensaver-gl and xscreensaver-gl-extra packages.