Adara recommended Phototonic. a month ago
Campbell recommended Eye of Gnome (eog). 2 months ago
rindeal recommended feh. 2 months ago
Phototonic is a fast and functional image viewer and organizer, inspired by the traditional image viewer design (i.e. thumbnails and viewer layouts)
nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.
Geeqie is a lightweight Gtk+ based image viewer for Unix like operating systems.