OpenPictureSpace displays a directory full of pictures in a thumbnail list view. It can displays jpeg, gif, png and iff ilbm pictures (including HAM and EHB specific Amiga modes). Other image viewers build a n x m grid with thumbnails. In contrast this soft scales images only vertically and places as many images into a line as possible. So the screen space is optimized for a maximum number of thumbnails.
Original web site.
MorphOS port with enhancements (sources modified included) and a picture grab available 
here.
Click on read more for more info.
New features since v2.3:
    * Added flag to not display directories.
    * Was crashing if right click and text font not loaded. Fixed.
    * Can show pictures names on thumbs.
    * Alpha sort done on picture names.
    * Working if path given is root.
    * Fixed a bug in SDL_image for some IFF/ILBM pictures with a mask.