This is a tool for binary diffing ida-analyzed binary files. --- The engine is using same algorithm as eEye binary Diffing Suite's DarunGrim. Binary differ is using C in the engine code, as compared to DarunGrim engine which is slow because it's written in python.
This project is complete as it is and new project called DarunGrim2 is undergoing here: http://www.darungrim.org. It's not opensource yet, but in the near future the source code will be avaiable. So check it out!