I used to use QuickPic and it was the GOAT for a simple, lightweight image viewer with some basic editing functionality. Then it got bought out by chinks who ruined it and I've never found another app that delivered quite the same experience. I'm currently using Simple Gallery which was pretty good until the slideshow function stopped working.

What app do you guys use? I have folders with many thousands of images that I like to slideshow in random order, that's important to me. I also like some basic editing (crop, rotate, etc).