There are many types of screen savers but some are really awesome. See this collection and download whichever you like.
1. RSS Saver
Loopy is the desktop screensaver application that is looping and showing the pictures at random for good. The most imperactive key ingredient of this application is the integration between the flash technology and RSS, that is provided by Flickr.
Cities of Earth is a free 3D screensaver which shows biggest cities of our planet. Many of cities with information about its population and country names. So it’s a good educational content. The positions of all cities corresponds to its real world coordinates.
RSSMore is a free rss screensaver that lets you subscribe to any number of RSS/XML feeds and view them in your rss screensaver. The RSSMore RSS reader screensaver loops through the list of feeds and shows the items and their contents in transparent text boxes over your background images.
You can now pimp out your desktop and catch more of the good stuff submitted to Digg every day with Digg screensavers. The screensavers are available for Mac and Windows users and include Adobe Flash 9 if you don’t have it installed. On the Mac you’ll need at least OSX 10.4 and on Windows you need either Windows XP or Vista.
Hongkiat insisted I include this. Time Machine screensaver comes perfect with your Time Machine wallpaper. When your Mac goes idle, the screensaver activates as though it’s coming from the wallpaper. It’s a perfect match.
MappedUp is an application that tracks a large number of RSS news sources and displays their latest items on a world map. By rolling your mouse over the dots, you can read the titles of all new articles. By clicking a title, you jump to the author’s website to read the entire article.
The Star Alliance Screensaver has many features which can be accessed through the StarSaver Options dialogue box. In all modes, the Star Alliance Screensaver displays your computer time and the number of Star Alliance member airline scheduled flights in the air.
Spruce up the functionality and aesthetics of your screeensaver with Fliqlo. Fliqlo mimics an old school clock with flipping digits. The time can be customized to display in 12-hour or 24-hour formats. Fliqlo is a free screensaver that has been around for ages.
17. The One Ring
This freeware screensaver has been specially created for all the fans of The Lord of the Rings and J.R.R. Tolkien. If you liked the book or the movie, this screensaver will make a great addition to your collection.
System 47 is a nice screensaver that will display Star Trek LCARS interface on your screen with various interesting animations. System47 was just a generic name made up for an arbitrary planetary system. Though the program has started and will continue to include more non-planetary displays in the future.