Composite C1 is a free open-source CMS based on the
latest Microsoft technologies. Composite C1 is completely free. Out-of-the-box
users have access to a fully functional CMS and the option to add free packages
such as SEO Assistant and social add-ons, or commercial packages such as
Composite also offers a commercial license with benefits
like product warranty, and a selection of professional services in the form of
support, training, and upgrade tools.