Oracle extends open source VirtualBox 4.0
Among the many technologies that Oracle acquired from Sun is the VirtualBox virtualization technology. This week Oracle officially release VirtualBox 4.0, improving performance, usability and scalability.
And guess what? The core product remains licensed under the GPLv2 - but wait there is a catch.
Starting with this new VirtualBox 4.0 release, Oracle has reorganized the project so there is a base release and then there are Extension Packs, that extend VirtualBox and aren't necessarily open source either.