The Best image viewers for windows can crop, rotate, convert, sharpen, etc. the images. Here I would like suggestions for read-only viewers.
I am a photographer and would run this on a laptop for clients to browse, examine, and review the album of my photoshoot with them (and just that album! :) ) and to pick or star the photos they like.
(I want this review done immediately on site, so that I can do immediate reshoots as needed. So no online services suggestions, please.)
I would prefer programs that are free for commercial use.