Raspberry Picture Frame Slideshow is focused on quick-to-set-up image slideshows for the Raspberry Pi. Just insert an USB key with actual images or URLs of remote ones inside and boot: the system will display a slideshow of them.
Raspberry Picture Frame Slideshow shows a full-screen view restricted to the slideshow; there is no way to escape this view but rebooting the machine. It is a hacker-proof secure operating systems for indoor and outdoor use.
See download page for download, installation and setup instructions.