OpenXenManager is a graphical interface to manage XenServer / Xen Cloud Platform (XCP) hosts through the network. OpenXenManager is an open-source multiplatform clone of XenCenter (Citrix).
The source code can now be found on GitHub using the homepage link below
VBoxCtl picks up where the native VirtualBox environment leaves off. Virtual Box provides and interactive environment for managing virtual machines and their execution. However, this environment does not expose all the most common options.