Which is the best image viewer program?
I'm looking for a program where I can easily do things with the mouse like switching to fullscreen, zoom in and out of pictures (freely and not just zooming in 2x/4x, etc.) and where I can open more pictures and switch between them similarly how I open more tabs in a browser.
Is this not a better question for /g/?
Irfanview is alright. No tab functionality though.
imagemagick and xterm in a tiling window manager will do what you need and much more.