Best screensaver software for free download

A screensaver is a computer program originally designed to conserve the image quality of computer display by blanking the screen or filling it with moving images or patterns when the computer is not in use. Today, screensavers are primarily for entertainment or security purposes.
Until recently, most computer screens depended on cathode ray tubes (CRT). CRT images are generated using electron rays which are "launched" from the back of the monitor and continuously "draw" pictures on the screen. Some of them (letters, animations, menus) are usually continuously moving or changing, and don't stay in the same place for long time. But some parts of the screen (like the Start bar in Microsoft Windows, or the typical upper "score" bar of some video games) are always in the same place, sometimes for hours or even days. These kinds of images, continuously drawn in the same place for a long time, can damage the screen because of electron rays always hitting the same screen points.
Screensaver programs were first designed to avoid these effects by changing the images on the screen when the computer was not in use. They are usually set up to launch automatically, waiting a specified amount of time after the last user's keystroke. The screensaver remains active until the first keystroke or mouse movement. At that moment, the screensaver closes and the former screen content is restored, to allow the user to work again.

Downloading software is free and easy. If the downloaded program doesn't satisfy you, just choose and try another one. Shareware (try before you buy) and freeware are available.

You can also take a look at screensaver games.