Stopmotion is a Free Software application for creating stop-motion animated movies. It lets you create an animation from pictures captured from a webcam, a videocamera or from pictures imported from the harddrive, add sound effects and export a file.
gptp is a simple gtk frontend for libptp which lets you control the settings and download images from your (Picture Transfer Protocol able) digital camera. so far only a few basic functions are supported and it was only tested with my Nikon D80.