Instagram - The Facebook-owned app allows you to apply filters to new or existing photos and put them up for friends and random users to see, all delivered in a smoothly-scrolling feed.
Camera Awesome - it is a free camera app that easily outpaces the default one on your iPhone. You can tap into a variety of presets to enhance your images, as well as use stabilization, burst mode, and timers, plus the app outputs to a wide array of sharing services.
Snapseed - is an excellent mobile photo editing suite that allows quick and smart adjustments with ease, plus if you do have another camera, you can edit those photos as well in very high resolutions (depending on device).
You may also read my previous article about the iMadeFace, a free avatar creator application.
