CDemu - CDEmu is a CD/DVD-ROM device emulator for linux, licensed under GPL v2 or later.
DiscFit - Download DiscFit for free. Arranges a big set of files or directories in order to use the minimum number of phisycal media (CD, DVD, BD...) pieces. You can drag the resulting sets directly over your burning software (Nero, DVD-go...)
UltraISO - CD image files are easily created with UltraISO.
Pismo File Mount - Pismo File Mount Audit Package is an application that allows users to mount the contents of ZIP...
DiscImageCreator - DiscImageCreator is an open-source and powerful disc and disk image creation tool that supports HD-DVD, XBOX 360, CD, GC/Wii, DVD, GD, and USB, Floppy, MO, and more.
The Unarchiver - Get the top application for archives on Mac. It's a RAR extractor, it allows you to unzip files, and works with dozens of other formats.