VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
VirtualBox 3.0.10 released! Sun today released VirtualBox 3.0.10, a maintenance release of VirtualBox 3.0 which improves stability and performance. See the ChangeLog for a list of changes since VirtualBox 3.0.8.
Tools and Utilities
Windows, Linux, Mac
Product page: here