gqview is clearly missing in the above list. While it is restricted to browsing only the contents of one directory, it provides since version 2.0 excellent search and printing functions (including flexbile arrangement of many pictures on one sheet), display of EXIF data, organisation of images into collections (independent from their storage location) and a powerful search function for similar or duplicate images. And above all, it's a very mature and fast program, also one that can be efficiently controlled by keyboard and combined with external programs (Gimp, image rotations, custom ImageMagick scripts) as keyboard shortcuts operating on images.
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