From Plain Black Corporation:
WebGUI is one of the most popular content management systems (CMS) available today. It is downloaded thousands of times per month and is in use as an Intranet application framework in many Global 1000 companies, governments, schools, and Universities.
WebGUI is a content management platform built to give average business users the ability to build and maintain complex web sites. It is modular, pluggable, and platform independent. Version 7.4.8 has new features in this release include: a Newsletter Asset, Private Messaging, new options for password recovery, a Site Starter design wizard, and many new improvements.