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Thumba Photo Editor, $0.99

These days, having a mobile device with a camera alone simply doesn’t cut it. For most, their phone also needs to be a portable photo studio, and for Windows Phone, there’s no better solution than Thumba. This powerful app allows you to manipulate your pictures in just about any way you can think of, easily incorporating filters, borders, crops, and adjustments, while providing a convenient portal to share them online. It includes GPS features too, so you can see where each shot was originally snapped.