XenSource

XenSource, Inc. developed enterprise-grade virtualization solutions based on the industries best server virtualization technology, the Open Source Xen hypervisor. Founded and run by the original Xen development team, XenSource products will allow enterprises to realize the TCO savings that result from server consolidation, increased utilization, and reduced complexity in the datacenter.

XenSource was acquired by Citrix in 2007.

It name is still visible in paths of different XenServer/XCP components, f.e. /etc/xensource, /opt/xensource, /var/log/xensource.log and so on.