John Hanna's TI-Slideshow

It lets you browse to a folder containing pic files from TI-73, 83, 83+, 83+SE, 89, 92, 92+, and Voyage 200 calcs and run a slideshow.

It offers two windows, one for selecting the path, the other for showing the pictures. You can run the show manually (up/down kbd arrow keys work, too) or you can run a timed show. You can resize or maximize the slide window and change the timing while the slides are playing.