Yes there is a Cue maker out there and it's quite good. It's called the Sega Cue Maker. I don't know where the offical site is however, but you can download it at elportal (link here). When downloading it make sure you don't have any download manager software active, like Get Right, or else it won't download. You just need the ISO or RAW file then the MP3s or WAVs named in some sort of order, then generate the cue.