feh is described as 'X11 image viewer aimed mostly at console users. Unlike most other viewers, it does not have a fancy GUI, but simply displays images' and is an app in the Photos & Graphics category. There are more than 25 alternatives to feh for a variety of platforms, including Windows, Linux, Mac, Xfce and PortableApps.com. The best alternative is IrfanView. It's not free, so if you're looking for a free alternative, you could try JPEGView or Preview. Other great apps like feh are XnView MP (Free Personal), XnView (Free Personal), Eye of GNOME (Free, Open Source) and Imagine (Free).