This is Viewnior, an image viewer program. Created to be simple, fast
and elegant. It's minimalistic interface provides more screenspace for
your images. Among its features are:

Fullscreen & Slideshow
Rotate, flip, crop, save, delete images
Animation support
Browse only selected images
Navigation window
Set image as wallpaper (GNOME2, GNOME3, XFCE, LXDE, FluxBox, Nitrogen)
Simple interface
Configurable mouse actions

Viewnior is insipred by big projects like Eye of Gnome, because of it's
usability and richness,and by GPicView, because of it's lightweight design
and minimal interface. So here comes Viewnior - small and light,
with no compromise with the quality of it's functions.
The program is made with better integration in mind (follows Gnome HIG2)

WWW: http://siyanpanayotov.com/project/viewnior/