The core Umbraco CMS is free to download and use for any website, it is free and Open Source. There are also many hundreds of add-on packages that have been written by the community which extend the functionality of Umbraco.
Umbraco are completely committed to the Open Source model for the core Content Management System, and have always maintain that the CMS will remain free forever.
This means that a large proportion of the Total Cost of Ownership of a website is substantially reduced, making it a tool well suited to business, academia and the not-for-profit sector.
Alongside the free core CMS, Umbraco also sell a number of paid-for plug-ins for Umbraco including Umbraco Forms and Courier. Umbraco also draws revenue from services such as hosting on Umbraco Cloud and Training and Support Services, and their paid-for Partner Programmes including the Gold Partner Programme which we are members of.
If you'd like to understand how much your next Umbraco project may cost then contact us for a quote.