ArtSaverApp provides a "slide show" or "picture flow" for large image collections you have stored in a folder (or several folders) on your disk. It is mostly geared towards people who want to see their images as large as possible, and with some information about each image currently being displayed.
With ArtSaverApp, you get more control than with Apple's built-in screensaver: at runtime, you can review previous images (using arrow keys) and a few other controls; in the settings, you can control exactly which images should be displayed, the duration, how it switches from one to the next, which information to display with the images, and more.
