Image crop for touch devices
I use the SimpleCrop module, hope it fits your needs.

SimpleCrop provides the simplest workflow for manual crop of images. Basically, you can crop image in three steps: upload image =&gt; select area =&gt; save content. Functionality of this module covers more than 90% needs of manual image crops.
One of the key feature of this module is that this crop can be used as-is for the end users. So you don't need to theme or to add a workarounds to show this image crop to someone else. It has minimalistic and usable UI.