Stop motion apps
When I do stop motion, I don’t use an App. I take photos using this Canon Digital SLR, transfer them onto my laptop, and then import the photos directly into a video editing program called Adobe Premiere Pro CS3.
However, I have used stop motion apps in the past, and there are lots of good ones available, many of which can be downloaded for free.
The apps I recommend are Stop Motion Studio, Clayframes and PicPac.