From redsquirrel87.com:

What’s it?
It’s an uncomplicated Linux tool to search for and download updates for your XBOX360 games direct from your PC (no require of XBOX Live!))
You have only to choose a XBOX360 ISO and the program mechanically will get the Media-ID (using ABGX) and will search for the late uncommitted modify on the online database of xbuc.net. Then you’ll can download it straight using this program, so without the take to unfastened any internet browser or extraneous programs.

What’s unexampled/fixed:
* Fixed a bug that could bring the program to crash during the download of the files.
* Added a function that checks if the file ABGX360 got correctly the execute permissions
* Added a timeout check to curl (30 unsweet)

Official Site: http://www.redsquirrel87.com
Download Linux v1.1: here
Download Windows (still at v1.): here

Source: Xbox-Scene Microsoft Xbox News