Pligg

Pligg is unique compared to most other content management systems because of it's flexibility.

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Developer: Pligg CMS
License: GNU General Public License (GPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), All POSIX (Linux/BSD/UNIX-like OSes)

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,