Caffeine for Mac - Caffeine is a tiny program that puts an icon in the right side of your menu bar.
Padbury Clock Screensaver - Minimal screensaver for Mac
Caffeine for Windows - Prevent your computer from going to sleep
XScreenSaver - XScreenSaver is the standard screen saver collection shipped on most Linux and Unix systems running...
Caffeine for Linux - Inspired by the Mac OS X version, Caffeine for Linux is a status bar application able to...
Really Slick Screensavers - Really Slick contains free 3D OpenGL screensavers.