Virtual Control Admin is a free web panel for OpenVZ servers. It in two parts, the web panel and the daemon. The daemon is used directly on the OpenVZ server. The panel can be installed on any server connected to Internet and having access to the server to control.
With VCA you can create, edit or remove virtual machines on OpenVZ servers. For each virtual machine you can define its characteristics, like memory, processors and disk space. With VCA you can also manage users and backups.