I just installed it to check it out. Nowhere near as "feature complete" as CPanel, but it looks like a good lightweight status monitoring dashboard. Allows some minimal configuration changes and provides a decent HTML5 console implementation.

It's closer to CPanel's WebHost Manager product (aimed at hosting providers/machine admins) than the customer-facing CPanel.

You login with your usual Linux user account and can do things like network and storage configuration, get CPU usage statistics, start/stop containers and VMs, that sort of stuff. Nothing you couldn't do via SSH, but presented in a straightforward UI.