Jack O'Lantern
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In this screen saver, you can turn gloomy pumpkin lantern into your mac screen saver. Interestingly here you can carve your PNG transparent and make your lantern to be displayed on your screen saver.
You can also find Apple logo as one of the default carving templates provided.
Screensaver X-Galaxy
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Screen saver built with a Leopard's nebula concept.
Plasma Tunnel
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By watching this screen saver, you will have a feeling of being taken into the depth of the water tunnel. You can customize the color of the tunnel's wall also.
Flux
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Mac OS X Screen Saver that uses the movement of spheres to create a stunning, colorful composition.
Solar Winds
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Flurry-like Mac OS X screen saver.
Fireflies
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The most colorful Mac screen saver that I've ever seen for now. More colorful than Flurry screen saver.
The Digg Labs
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The Arc of Digg as your Mac screen saver. Everyone should have known about this already.
Flickr Shuffle Screen Saver
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This screen saver can load your favorite photos from Flickr, shuffle them, add customizable transition effects and display them as your screen saver. It's worth a try. Really.
Time Machine Screen Saver
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This Time Machine screen saver combines the Time Machine space time warp and your trustworthy RSS reader, making it so much of convenience (and awesomeness) for reading your RSS while also running your screen saver.
MovingPhotos 3D Screen Saver
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An absolutely beautiful screen saver. This screen saver gives you the freedom on choosing your pictures folder and then works on it to create animation of photos flying around, constructing a virtual building. This is a must have screen saver.