This application is made for folder synchronization.
It is made in VS 2010 (C#), .net Framework 3.5 is required. It use threading, so window will not get frozen at any moment.
This software can be used in web development(very large number of files) and for any other use(music,movies,data…). With these app you can solve problem of copying large folders with subfolders and files if you dont need so, you can copy only new or changed files or folders.