SolusVM is a virtual server control panel from SolusLabs Ltd. SolusVM supports full OpenVZ virtualization with Xen, KVM and BSDjails to follow and has the ability to manage a large array of virtual servers across multiple nodes all from one management interface.
SolusLabs maintain their own fully featured module for WHMCS.
Here’s a list of its current features:
See http://wiki.solusvm.com/index.php/WHMCS_Module for setup instructions