I'm a fan of SereneScreen Marine Aquarium, although it isn't free. It's just $19.95, though, which isn't bad in my opinion. I don't know if there are better aquarium screensavers out there, but this ...
Way back when: People used screensavers to prevent "burn-in" on CRT monitors, where static images could permanently damage the screen. Screensavers like 3D Pipes animated the display during inactivity ...
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