Another cool photo-app for iOS went free for a limited time. Fotor CameraBag (click here, $1.99 usually) makes iphonography easy and fun. It comes with a well working HDR imaging engine, plus the usual assortment of filters, frames and enhancing options. Moreover, you can make collages of your pics and tilt-shift lenses can be simulated. Social sharing is also available. The app works on the iPhone, iPod touch and the iPad running on iOS 4.3 or greater.