Flash2X Screensaver Builder 

Build Macromedia Shockwave Flash screensavers and distrubite them to world wide. It supports building freeware or shareware screensavers, and other customized settings.
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screenMX 

Make your own flash screensaver with Flash and use screenMX to convert your swf to screensavers! screenMX allows you to preview SWF screensavers, embed external SWFs, create unlimited screensavers, include automatic compression and much more.
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