Daydreamer will display a picture pointed to by a URL and update it as often as you like. Daydreamer will handle several pictures at once. You can have Daydreamer make time lapse movies of the URL picture, adding a new frame to a movie each time the picture is refreshed. Daydreamer is Applescriptable, which adds to its versatility. With sample scripts provided with the distribution, you can view slide shows of picture folders on your computer, or even make those slide shows into QuickTime movies. | 
