QCDesktop 0.5 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program is categorized as Theming Tools. The actual developer of this free Mac application is Ulrik Sverdrup.
From the developer:
QCDesktop displays Quartz Compositions on your Mac OS X Tiger desktop.
Your desktop image is given the life of Quartz Compositions that can display any kind of animated art; a blue sea, an RSS feed, a clock.
QCDesktop imports settings from the Screen Saver preferences database. To modify composition settings, open the Screen Saver preferences panel, select the composition and click "options…".
You may want to check out more software for Mac, such as scarytime v9, Christmas Tree Creator '04 or SaverPreview, which might be related to QCDesktop.