iScreensaver Designer

iScreensaver Designer is a cross-platform screensaver editing toolkit that builds screensavers for both Mac OS X and Windows XP thru 7, using Images, QuickTime files, MPEG and H.264 Movies, as well as Adobe Flash (SWF) files. It includes a powerful OpenGL animation engine, and a built-in single-file installer. A free trial version with no time limit is available for download.

Version 4.5.0:

• iScreensaver Designer 4.5 is a bug-fixing update. Upgrades are free for customers with a valid version 4 license.
• Version 4.5 includes important bug-fixes for both Mac OS X and Windows screensavers. Screensaver and Wallpaper installers are more reliable. Missing plugins are handled more elegantly. Playback is smoother with reduced flashing between items. OpenGL support
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Requirements

• OS X 10.4.11 or later for created screensavers
• OS X 10.6.8 or later recommended for authoring