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App Switch Beep is a background application that plays the system sound.

Run screensavers as desktop background.

Goldberg is a freeware image and movie viewer with image editing capabilities

XnConvert is a cross-platform batch image-converter and resizer.

Display and edit types of image files.

Scripted, non-linear editing of video and image files.

Powerful, free image editing application; now a native Mac app.

Scientific image processing and analysis.

Basic image creation and editing application.

Comprehensive software platform for medical image analysis.