This is probably almost every Linux Admin using Citrix Xenserver will be looking for. A way to manage xenservers from Linux machine. Citrix XenCenter is available only for windows machines. Although citrix is using Xen & Linux, citrix forgot to build client for Linux machines.
If you are using Linux machine for routine work, and because of xenserver if you need to connect windows machine / reboot to windows, you may get annoyed. Citrix should have provided XenCenter for Linux.

Anyways, this is where OpenXenManager works.
OpenXenManager (aka OpenXenCenter) is a client application to connect to the XenServer Host through the network. OpenXenManager is a open source clone of Citrix’s XenServer XenCenter. OpenXenManager is written in python with pygtk and a and gtk-vnc (or vncviewer). You can monitor your virtual machines, access virtual machine consoles, perform allowed operations (start, stop, suspend, reboot…), create virtual machines, and more.
How to download / install. (you can also schedule following command to fetch updates)
svn co https://openxenmanager.svn.sourceforge.net/svnroot/openxenmanager openxenmanager
Running openxenmanager
python window.py