VirtualBox
Category: Developer
Short Description: 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.
Details: Some of the features of VirtualBox are
Modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once for example you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line or possibly remotely. VirtualBox also comes with a full Software Development Kit even though it is Open Source Software you dont have to hack the source to write a new interface for VirtualBox.