XPatcher is GUI front-end for flips, libppf, xdelta, and libRUP patching libraries
This app allows you to apply patches to files on your iOS devices , mostly used to apply rom hacks to video game roms
With a simple to use interface to make it as user-friendly as possible
launches into the Documents directory (/var/mobile/Documents)
so you can place your roms and patches there and start patching
Source code available
on Github