It's been interesting to watch which components of Sun Microsystems' portfolio of products--many of which were open source projects--Oracle has chosen to embrace or abandon since its acquisition of Sun. One project that it hasn't jettisoned is VirtualBox, which has just arrived in a new version 4.3. The popular hypervisor is now tuned to work with operating systems that have just arrived, including Windows 8.1 and Mac OS X 10.9 ( "Mavericks" ), and it's also tuned to work smoothly with Linux distros. The new version also supports multi-monitor setups and touch interfaces conventions.
According to an announcement from Oracle:
"Another significant, but largely invisible change in 4.3 concerns the hypervisor itself. We have significantly revamped the internals of VirtualBox as a platform for future performance enhancements. Today, this has mainly improved boot times of guests, but we'll be building upon this in forthcoming updates."