I don't know of a native OS X app, but you could try iSlide, a chrome browser extension. I used it for a few months now, and I was quite happy with it (although I have a few niggles: like most web browser extensions, I worry about security (even if it states that it uses manifest version 2)).
To quote the blurb from the site:
Ever got to web page with a thumbnailed image gallery and wanted to
view all of the pictures? Like me, you probably had to click each
thumbnail, then click on Back, then click on the next thumbnail and so
on... No more! With iSlide you get to watch all the large images with
one click! Just click the iSlide icon in the Chrome Extensions toolbar
and a slideshow based on the currently selected tab will open in a new
BTW, I would also be interested in a native OS X application too.