Free Photoshop Express App

The desktop version of Photoshop is a pretty pricey program, so it is surprising that the Photoshop Express app is free (there is a $9.99 version as well, Photoshop Touch, which is more robust).  Admittedly, the online message boards are alight with dissatisfied users who preferred the previous version of Photoshop Express, but personally I found it easy and fun to use, with an intuitive interface and useful, if limited, set of tools. It is available for both Apple and Android devices, and both tablet and phone.

There are more tools available on the tablet version (screenshot at right) than there are the phone version (screenshot at left).  Both allow you to do basic cropping/rotating/straightening and color correction.  Both have a variety of special effects and borders from which to choose.  Available (and free!) at the iTunes Store and Google Play.