QuickTimeVR Toolkit. It was painfully slow on my Quadra and the stitching usually had to manually corrected by nudging the images around (didn't help that this

QuickTimeVR Toolkit. It was painfully slow on my Quadra and the stitching usually had to manually corrected by nudging the images around (didn't help that this was pre-digital cameras and errors in slide registration and scanning compounded) but I thought it was close to magic - even if it was running in MPW ;-)