image mask

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.

Edit image-description extensions of QuickTime movies.

Update image metadata with location-specific information.