cPanel and WebHost Manager (WHM) is a fully featured all-in-one web hosting control panel that allows easy administration of your web servers, and also provides your clients with a simple to use web interface to manage their web hosting accounts. cPanel takes control of every aspect of managing your web sites with tools for email, file management, databases, and much much more.
Want to see it in action? Try the online demo.
Visit the cPanel website for more information.