Agar provides a base GUI framework and a standard set of widgets from which graphical applications can be built which run natively under X11, Windows, MacOS, SDL and others. It takes advantage of texture and GPU acceleration wherever available. Agar can also attach to an existing framebuffer, SDL or OpenGL context and operate as a self-contained window-manager.
It includes a standard library of general-purpose widgets, and is also designed to be extended externally. New widgets can be...
Java Slideshow is a platform independent image viewer especially for huge collections. It provides an easy command line interface, supports tagging and view by category, zoom, move and has some filemanager functions like delete file or find duplicates.
ImageSorter is image browser/filemanager for unix systems writen in perl/glade/gtk and uses imlib graphic library.
It has many advanced features like multiple panes, viewing multiple images, regexp selections, drag-n-drop, finding duplicate files,...