iPhone: The burst mode on iOS is great, but Apple doesn't provide a good way to piece them all together. Burstio turns those photos into GIFs or videos.
All you need to do is take a few photos in burst mode (hold down the shutter button while taking a photo) and then import the set into Burstio. You can edit for length, then export as an animated GIF or video. Burstio isn't packed with a ton of features, but the basic GIF creation is a handy way to get a little more use out of the burst mode.
Burstio ($1.29) [iTunes App Store]