Somewhat minimalistic image
browser, a good alternative to xv
(for it loads faster), display
(for it is not a UI terror), gqview
(for it does not take over your machine nor aspires to pretty design).
It is meant to be called from a shell, as in
By hitting the spacebar you signal the program that you want to flip to the next picture. This makes xloadimage uniquely suiteable for one handed activites.
On cool systems, xloadimage is aliased to xli.