I came across a few applications on Adobe’s website they offer photoshop editing through the browser called Photoshop Express. It allows you to do basic photoshop editing such as cropping, hue, black and white and various others. Best of all its free to use. The website can be found here http://www.photoshop.com/tools.
Adobe has also created Photoshop for mobile devices for Android phones and Apple phones. Both apps for either phone are free.
For Android: http://mobile.photoshop.com/android/
For Apple iPhone/iPad: http://mobile.photoshop.com/iphone/