AppStartSaver - Simple screen saver that launches a Mac application when it starts
Version: 2.0 BetaAppStartSaver is a simple screen saver for Mac OS X that launches a regular Mac application, or a Unix executable, of your choice when the screen saver starts.
Operating System: Mac OS X
AppStartSaver will launch Mac OS X (native, classic, or mixed) applications or unix command-line executables. It can launch AppleScripts if they are compiled as Carbon applications using the Script Editor. For applications, you can specify documents to be opened; for Unix commands you can specify text command-line options to be passed to the command.
You can control the opacity or transparency of the black window that the screen saver uses to blank the screen. If you set it to transparent, you'll see the regular Mac desktop and windows while the screen saver runs. This allows you to use the launched application's output as a kind of screen saver, or to monitor its progress.