ClearOS Enterprise is a server, network, and gateway platform designed for small businesses and distributed enterprise environments. ClearOS Enterprise is based upon ClearOS Core which is a rebuild of Red Hat Enterprise Linux. The distribution is flexible and includes an extensive list of features and integrated services which can be configured through a web-based interface. Some of the tools found in ClearOS Enterprise include anti-virus, anti-spam, VPN, content filtering, bandwidth manager, file services, SMTP services, print services, SSL certification, and web services. ClearOS includes a marketplace which simplifies the installation of software including 3rd party modules. The distribution is provided as a free download, inclusive of basic OS updates with free registration.