GImageView is a GTK+ based image viewer which supports tabbed browsing, thumbnail table views, directory tree views and drag and drop. It also support movies using the Xine library and MPlayer, and supports images in compressed archive formats.
FOX is an Extensible C++ Class Library for Multi-Platform GUI development.
Platforms supported include Linux, Windows NT/9x/2K, and UNIX/X11 workstations
(IRIX, Solaris, HP-UX, Tru64, AIX, FreeBSD, and others).