imageTagger makes it easy to manage tags of different images and so organise large collections of image collections. It features the ability to assign free tags to images and to search for pictures with tags. The tags are stored externally, so this can also be used for files that should not be changed, files on CDs, and pictures in a format that does not support metadate. No image data is changed ever.
Galapix is an image viewer that allows you to directly zoom into large collections of tens of thousand of images from tiny thumbnails down to the images' original size fluently with short load times and no loss of interactivity. It accomplishes this by keeping a tile cache which stores not only thumbnails for one size, but thumbnails of many different sizes.
F-Spot is a personal photo management application for the GNOME desktop. It simplifies digital photography by providing intuitive tools to help you share, touch-up, find, and organize your images. These tools include editing, color adjustments, tags, Photo CD creation, and exporting for upload.
Jim (Java Image Manager) is a program for managing your personal images (photos, etc.). While Jim is really easy to use, its tagging technology is quite powerful. A plugin system makes it easy extensible with new technologies. It runs on several operating systems (including Windows, Linux and many more); all you need is a Java Runtime Environment.
Smitten differs from traditional media centres in three major ways. It contains no media playback at all, which makes it very small (and suitable for porting to embedded systems) and quick to initialize. It targets a TV display and interface, which means there's less information on any particular screen, and a much simpler control interface consisting of left, right, up, down, and select. No mouse is required. It is also highly skinnable, and cross-platform to most systems. Essentially, it provides an easy-to-use menu system that allows the user to navigate a hierarchy of files, and view them using an (external) tool.