CDemu - a virtual CD/DVD drive for Linux. Project includes Linux kernel module & userspace utilities.
This shit gives problems compiling, poor documentation about compiling and it have stupid bugs, also it is a pain in the ass configuring this piece of butt-crap in other distros that aren't Ubuntu, wonderful!. You have to use the bleeding-edge Ubuntu otherwise you will have a pain in the ass packaging or compiling this piece of buttcrap, software that targets just one distribution, and worse just one version of it is software that sucks.
SOme more Info in the description would be nice… eg., does it handle compressed images like ccd/cxd, proprietary formats like cue/bin, nrg and the like; simulate copy protection (for completely legal personal back-ups of owned originals); or anything like that? If it is "just another mount wrapper" for the fses available with mount and diverse standard libs like fuse, I'll shred it right away (Didn't try anything out yet, still DL'ing for evaluation).