Evince is a document viewer for PDF, PostScript, DjVu, TIFF, XPS and DVI formats.

ExifTool is a free and open-source software program for reading, writing, and manipulating image, audio, video, and PDF metadata.

Image Eye is a specialized image viewer, made for the sole purpose of viewing images as quickly and practically as possible.

Okular is a universal document viewer based developed by KDE.

F-Spot is an unmaintained image organizer, designed to provide personal photo management for the GNOME desktop environment.