A partial list of iPhone/iPad Apps. Go to iTunes and search time lapse for a bunch more.
A list of Android apps (feel free to add iOS apps below) which take timelapse image sequences, so you can use them on a balloon mapping rig for aerial photography. Most important is whether they capture in the full resolution of the camera, and/or if they compress to make it into a video.
- Timelapse - $1.99, captures up to 2048x1536
More recently released, look pretty good but untested: