Pligg is a popular open source content management system available for download at no cost.

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Developer: Chuck Roast
License: Affero General Public License
Operating System: unix, linux, win,

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

Innovative webbased Content Management System (CMS) genuinely focused on flexibility, usability, standards compliance, modern PHP5 coding practice (ala ruby on rails).

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Developer: Sigurd Magnusson
License: BSD License
Operating System: windows, linux, mac os x

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

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

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