Host a virtual operating system
Oracle VM VirtualBox is an industrial-strength open source virtualisation tool that makes it easy to create virtual machines (VMs), simulated computers that run on your PC but act as though they were separate systems. It's a powerful capability that has many different applications.
If you'd like a closer look at Windows 8 before you upgrade, for instance, then you could install Microsoft's latest in a VM, then access it in a window on your XP or Vista desktop.
Or maybe you've upgraded to Windows 8 and find a favourite old app doesn't work any more? Create a Windows XP VM and you might be able to run it again.
VirtualBox can also be a useful security tool: if you download and test apps in a VM, then any malware you might encounter will be isolated from your main system.
And it's the perfect choice if you want to try out another operating system with the minimum of hassle. Right now you can install Google Chrome OS, all the mainstream Linux variants (2.4 and 2.6), OpenBSD, OS/2, ReactOS, SkyOS, DOS, and just about every version of Windows there's ever been. (Of course you'll need to have the system discs to hand.)
New additions to VirtualBox 4 include an interface redesign, making it easier to view and manage your virtual machines. VM displays can now be scaled, so you can reduce a window size by half (for instance) and still see everything that's going on. The ability to limit a VM's CPU and IO time means the program will be less of a drain on your system's resources, and there are a host of other performance optimisations and bug fixes available
Final Verdict: This professional quality virtualization package must be one of the most powerful open source tools around
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Get the low-down on every aspect of your PCs hardware and software with this in-depth system information tool
Function Limited Demo
Automatically optimise, tweak and enhance your PCs performance in just a few clicks
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Keep your life in order with this capable scheduling tool
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Free up space on your Mac by removing unnecessary files
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Powerful dual-pane file manager with strong archive, FTP and macro support
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A powerful dual-pane file manager with strong archive, FTP and macro support
Open Source
Run multiple command line windows from a single tabbed interface
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Take control over the drive letters assigned to your USB devices
Free, for personal-use only
Take control over the drive letters assigned to your USB devices