Who it’s for: iPhone photogs who want to shoot in low light conditions
It's a little pricier than the other apps here, but ProCamera 8 is worth the cash. The main draw of this app are the doors it opens in regards to where, when, and what you can shoot. With video capability, exposure control, HDR, and manual focus, you can shoot at night, in low light -- wherever you want. The extensive set of filters is pretty sweet, too.