High Quality Content by WIKIPEDIA articles! Represented by their respective products, VMware and Parallels are the two major commercial competitors in the Mac consumer virtualization market. Both products are based on hypervisor technology and allow users to run an additional 32- or 64-bit x86 operating system in a virtual machine alongside Mac OS X on an Intel-powered Mac. The similarity in features and functionality between VMware Fusion and Parallels Desktop for Mac has given occasion for much comparison.