You can resize the thumbnails at anytime so you can view the images with various scales. PhotoGrid works like an image database but you don't have to register image files in order to organize the database. Ordinary folders themselves are the database. Caching into full given memory and a swap file makes PhotoGrid show images virtually with no delay. PhotoGrid works well if given 4.5 MB of memory.
Slide show capable.
PicPops is a simple picture viewer that allows you to open PICT, TIFF, GIF and JPEG files. Printing and exporting in any format is supported by QuickTime. The Pictodex Viewer can also present slideshows, in either a timed or manual mode, and can loop them indefinitely. It can even be used as a basic image viewer since it can display and print any image type that QuickTime can recognize. Demonstration images are included in the download.