Developer(s)
Alfresco Software, Inc.

Initial release
November 2005

Stable release
Community Edition 5.0.a[1] / June 27, 2014

Platform
Java, JSP and JavaScript

Operating system
Cross-platform

Type
ECM

License
Enterprise Edition is proprietary; Community Edition is LGPL v3

Website
www.alfresco.com

Alfresco is a free/libre enterprise content management system for Microsoft Windows and Unix-like operating systems. Alfresco comes in three flavors:

Alfresco Community Edition is free software, LGPL licensed open source and open standards. It has some important limitations in terms of scalability and availability, since the clustering feature has been removed from the community repository and is only available in the enterprise edition.
Alfresco Enterprise Edition is commercially & proprietary licensed open source, open standards and enterprise scale. Its design is geared towards users who require a high degree of modularity and scalable performance.
Alfresco Cloud Edition (Alfresco in the cloud) is the SaaS version of Alfresco.