Parallels has released a Final Candidate pre-release beta of its virtualisation software for Intel macs, called Parallels Desktop Release Candidate for Mac.

The software isn't just a dual-boot solution, as it allows users to use Windows, Linux and any other operating system at the same time as Mac OS X, more akin to Virtual PC.

A free, fully functional download version of the software is available now. Interested users can also pre-order the full release version of the software at the reduced price of $39.99, $10 beneath the projected regular retail price.

Parallels Desktop Release Candidate for Mac offers extensive OS support, including: any version of Windows (3.1, 3.11, 95, 98, Me, 2000, NT, XP, 2003), any Linux distribution, FreeBSD, Solaris, OS/2, eComStation, or MS-DOS in secure virtual machines running alongside Mac OS X.

The application includes a selection of set-up wizards to make it easy to install foreign operating systems on a Mac, though users must buy their selected OS separately. The software works on an Intel-powered Mac.

The developers have applied a number of changes to the software since the most recent beta release, including adding a new interface, better performance and stability, and improved USB, networking and sound support.

A video has appeared on YouTube which shows a new black MacBook running three operating systems using the Parallels solution.