ISO Master

"ISO Master: an open-source, graphical CD image editor that runs on Linux; and bkisofs, the underlying library used for reading, modifying and writing ISO images.

Basically you can use this program to extract files from an ISO, add files to an ISO and create bootable ISOs.

The hard part of this project is the library for working with ISOs (bkisofs). My hope is that people will like this library enough to make their own GUIs using it. So my choice of widget set (GTK, that is) will not necessarily annoy too many people."

http://littlesvr.ca/isomaster/

http://littlesvr.ca/isomaster/downloads.php