goombah99 writes "After snapping up virtualization company InnoTek at the beginning of the year, Sun has recently released VirtualBox as a fully functional and highly polished free GPL open source x86 Virtual Machine. It can host 32- or 64-bit Linux, Windows XP Vista and 98, OpenSolaris and DOS. It runs on Mac OS X, Windows, and Unix platforms. The download is just 27MB. A review of it on MacWorld, showing HD movies playing inside windows XP on a mac, demonstrates performance visually indistinguishable from VMware. Like its competition, it can run other OSes in rootless, rooted, or seamless modes display modes (where all the applications have their windows mixed at the same time). Each VM instance can only run single core (though I/O is multi-core), and it does not yet support advanced windows graphics libraries however, so some gamers may be disappointed. Slashdot discussed the InnoTek acquisition earlier.