cPanel is the most widely used Control Panel tool on the web hosting market. It's feature-rich and it features an easy-to-use interface which will give you full control over your websites. It is easy to handle files, emails and databases, view usage statistics, install script-driven applications, etcetera. This software is preferred by many web hosting companies, as it also has a reseller counterpart called WebHost Manager (WHM). The aforementioned tool will give you a web-based graphical interface, through which you can manage a number of server-side settings, generate hosting plans or new customer accounts and modify their features with just a couple of clicks. You may also set up different modules and applications, update DNS records, brand all the cPanel accounts that your customers will get, create and remove features from their Control Panels, etc. cPanel and WHM are compatible with nearly all billing applications out there, so this is one of the best platforms in case you would like to become a reseller.