Oracle's VM VirtualBox is a powerful, free, and open-source virtualization tool—but you'll have to do some tinkering to make it work for you.

Oracle continues to fix bugs in a timely fashion. The first version of VirtualBox 4 I tried in January 2011 would leave my USB Webcam running for no reason, and the main dialog where you launch ...

Oracle said that VirtualBox 4.0 allows developers to create extensions to customise the VirtualBox, adding new functionality.

After entering beta roughly three months ago, Oracle’s VM VirtualBox 5.0 virtualization software is now generally available, offering faster performance and better security.

Oracle's VM VirtualBox is a powerful, free, and open-source virtualization tool—but you'll have to do some tinkering to make it work for you.