Daisy is a comprehensive content management application framework, consisting of a standalone repository server accessible through HTTP/XML (using the ReST style of WebServices) and/or a high-level (remote) Java API, and an extensive browsing and editing DaisyWiki application running inside Apache Cocoon.

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Developer: outerthought.org
License: Apache License
Operating System: OS Independent (Written in an interpreted language)

Hippo CMS is an open source information centered content management system.

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Developer: Tjeerd Brenninkmeijer
License: Apache Software License
Operating System: Unix, Windows

Combines content management, e-commerce, and site management.

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Developer: Carol Skelly
License: Free for non-commercial use
Operating System: Windows

if you are looking for an easy and legal way to publish youtube videos at your website you have reached the right place.

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Developer: Holger Deschakovski
License: Freeware
Operating System: Linux, Unix

Pheap offers a simple, bold interface that masks a powerful content management system.

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Developer: Spencer Akers
License: Freeware
Operating System: ALL

Web application designed to simplify the static content management of the websites.

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Developer: Mariya Imangulova
License: Freeware
Operating System: Linux, Win32

Micro CMS is the only program available that combines a search-engine-friendly WYSIWYG with a simple, AJAX-based content management system, making the management of your static web site incredibly easy and fast.

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Developer: Implied By Design LLC.
License: Freeware
Operating System: Linux / Windows