Alfresco is one of the leading open source enterprise content management systems (ECM). For more details about ECM refer to the Wiki; https://en.wikipedia.org/wiki/Enterprise_content_management. Alfresco allows you to manage content in a simple and smart way. It provides enterprise solutions based on open standards, and open source technologies for managing business critical content. As it is a very stable player in the market and provides enterprise-level features and support, Alfresco has been named Visionary by Gartner for five years in a row. Gartner is a leading research company, which provides insight into technology; refer to http://www.gartner.com/technology/about.jsp for more details about Gartner.