(commercial) AlteredSaver is an OpenGL screen saver which also runs as a stand-alone application.
CMatrix simulates the screensaver from "The Matrix" from the movie's website. It works with your terminal settings (up to 300 cols wide) and can scroll lines all at the same rate or asynchronously and at a user-defined speed. Read more
Electric Sheep is a free, open source screen saver run by thousands of people all over the world. It can be installed on any ordinary PC or Mac. When these computers "sleep", the screen saver comes on and the computers communicate with each other by the internet to share the work of creating morphing abstract animations known as "sheep". The result is a collective "android dream", an homage to Philip K. Dick's novel Do Androids Dream of Electric Sheep. Read more
This is a simple program that attempts to generate the graphical outputs of the swirl screen-saver from the xscreensaver collection. It even tries to do better than the original `swirl'.
Fields is a small force field simulator in the form of a screen saver. Particles react to each creating interesting visual patterns. Lots of parameters can be set to achieve different visual results in the simulation.
Fireflies Screensaver is a screensaver that uses OpenGL for 3d acceleration.
FLAM3 is the rendering engine for the Electric Sheep distributed screensaver. It allows you to manipulate, animate, render, and evolve abstract imagery.
FlowerAttack is a screensaver for KDE 3.x. It sort of behaves like a limited particle system. It is quite configurable. For example, you can change the number of emitters, images, colors, and so on. You can even create your own presets in order to quickly switch between experiments.
Flying Windows is an amusing "Flying Windows" screensaver. It starts out like the one shipped with MS-Windows, with little logos flying out towards you, but then comes the good part: your favorite Unix-variant character appears and begins blasting the logos out of the sky!
jaron is a modularized text mode screen saver. It displays different animations and string animations in a partially random order.
Matrixgl is a 3D screensaver for Linux (partially for KDE) based on "The Matrix Reloaded". It supports widescreen setups.
NCmatrix is a ncurses-based screensaver that produces the familiar display of vertical characters with added functionality to display network traffic. /proc/net/dev is polled to grab incoming and outgoing packet information, and the results are displayed as long or short colored streams of characters in the display, depending on the number of packets transferred since the previous poll.
Paper Pilots Screensaver
The Paper Pilots screensaver is a 3D screensaver for OS X and Linux. It allows the user to customize up to 20 different screen configurations, choosing various combinations of airplanes, balloons, and scenery. A trial version is available for download.
Phyllotaxis Screensaver draws a golden ratio-based spiral that often occurs in nature.
QMLSaver is a modern screensaver written in Qt4/QML. It works on Gnome/KDE4.
Really Slick ScreenSavers GLX Port
A port of some nifty OpenGL screensavers that were originally written for Windows to GLX. It is intended for use with an existing screensaver daemon like xscreensaver.
Really Slick XScreenSavers
Really Slick XScreenSavers is a GLX port of the Really Slick Screensavers collection.
rsaver is a simple X screensaver. It uses only Xlib. After specified amount of time it will start to draw radioactive signs. If timeout is not specified, rsaver will get this value from X server.
termsaver is a simple text-based terminal screensaver.
The Idle Screen Project
The Idle Screen Project is a collection of screen savers. The screen savers use OpenGL and Qt 4.
TuxSaver is a KDE screensaver that shows the adventures of tux, living at the South Pole.
xprintidle is a tool that prints the user's idle time to stdout, using the X screen saver extension.
XRazzle draws animated, color-cycling, abstract, random-line stereograms (the kind you have to cross your eyes to see). Have a look at the screenshots, and imagine the designs and colors constantly changing. No, you won't see a dinosaur or a boat or anything like that, they're completely abstract.
The xscreensaver program waits until the keyboard and mouse have been idle for a period, and then runs a graphics demo chosen at random. It turns off as soon as there is any mouse or keyboard activity. It can also lock the screen (immediately, after a longer idle period, or on demand.) xscreensaver consists of two parts: xscreensaver itself (the ``driver'' or ``daemon''), which detects idleness and does locking; and the many graphics demos that are launched by xscreensaver.
XScreenSaver.App is a Window Maker dockapp that will lock your screen (using XScreenSaver) and will give you the XScreenSaver configuration options when right-clicked.
Xtra Screen Hacks
Xtra Screen Hacks is a collection of graphics display modes that are meant to be run with a daemon such as XScreenSaver.