SolusVM!

Proxmox Virtual Environment is an easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines.

Commercial Linux-based VPS management control panel with full support for KVM and OpenVZ virtualizations. It presents perfect tools for creating virtual machines, providing VPS hosting services and building cloud infrastructure.

Virtualizor is a powerful web based VPS Control Panel. It supports OpenVZ, Xen PV, Xen HVM, XenServer and Linux KVM virtualization. Admins can create a VPS on the fly by the click of a button. VPS users can start, stop, restart and manage their VPS using a very advanced web based GUI.

XO is a web UI providing a simple and nice web interface to manage XenServer (or Xen+XAPI) infrastructure (VM, servers, pools, etc.)

Archipel is a solution to manage and supervise virtual machines. No matter if you have a few locally on your computer or thousands through data centers, Archipel is a central solution to manage them all. You can use all libvirt-supported virtualization engines like KVM, Xen, OpenVZ or VMWare. You can perform all basic virtualization commands and many other things like live migration, VMCasts, packages, etc.

WebVirtMgr is a libvirt-based Web interface for managing virtual machines. It allows you to create and configure new domains, and adjust a domain's resource allocation. A VNC viewer over a SSH tunnel presents a full graphical console to the guest domain. KVM is currently the only hypervisor supported.

VirtEngine is a Cloud Management Platform software panel used to build Private and Public Clouds (For Hosting Provider) - Our Cloud Panel which also supports VPS Servers as well as smart Cloud Computing Servers.

Virtkick makes VPS hosting easy for your clients with the lightweight and user-friendly approach. Whether you're a small data center, a game hosting company or a huge enterprise, Virtkick is easy to plug-in and make the most of your hardware without extra costs.

OpenNode Cloud Platform is an open source server virtualization and management solution, offering an easy and flexible way for creating your IaaS service.

Sadeem simplifies selling IaaS hosting; with a built-in self-service portal, billing and support system

Feathur is a VPS control panel based on PHP. Typical Feathur installers create a linux based nginx, php and mysql system (LEMP) with a built in PHPMyAdmin and control VPS via SSH connections. Feathur is designed to have global administrators and individual users. Each administrator can control all of the VPS in the system. Each user can control any VPS assigned to them by an administrator.

Fleio is a billing solution and self-service control panel for OpenStack that enables a public cloud startup to launch its OpenStack services offering in a matter of days.

Open source virtualization manager. Deploy and manage Xen and OpenVZ containers/VPSes through easy to use graphic user interface. Free and flexible.