Silvercode

Diaphanous Rotation 3D is a real-time 3D rotation screensaver which rotates
a logotype or picture of your own choice on a transparent background.

Silvercode ScreenSaver is a screensaver which shows a logotype or picture of
your choice. Among the features is a real-time 3D rotation of the picture!

http://www.silvercode.com/

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Frank Bohan
¶ My other computer is an abacus.