Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
Loxi - Easily add an events calendar to any website.
Padbury Clock Screensaver - Minimal screensaver for Mac
Future - Calendar events around the clock
Really Slick Screensavers - Really Slick contains free 3D OpenGL screensavers.
Calendar by 44 - Blazingly fast calendaring