VSCO Cam (iPhone, iPad and iPod touch)
If there's one specific area in which iOS apps far outshine other platforms, it's photography, and VSCO Cam is one of the cooler, more unique photography downloads. The free app gives you endless options to tweak and enhance your photos, with editing tools for exposure, temperature, contrast, cropping, rotation and much more. "Packs" of filters are available for free, and you can purchase more. You can import and export full resolution images, and the app makes sharing on social networks simple.