Liferay Enterprise Portal is a Java/J2EE portal system that provides personalization (like Yahoo.

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Developer: Liferay Developers
License: MIT/X Consortium License
Operating System: UNIX, Win NT, XP, Linux

YaWPS (Yet another Web Portal System) is a hybrid between a content management system and a web portal for medium- or small-sized Internet- or Intranetsites.

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Developer: Adrian Heissler
License: GNU General Public License (GPL)
Operating System: UNIX platforms as well as on Windows platforms.

TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets.

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Developer: TYPO3
License: GNU General Public License (GPL)
Operating System: Unix, Windows (any)

PHP Content Management System (phpCMS) makes it possible to need only one template for your whole Web site.

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Developer: Bernhard Grün
License: GNU General Public License (GPL)
Operating System: Linux, Unix, Windows

PHP meta tag generator offering a wide range of tags including MS Smart tag blocking.

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Developer: Michele Neylon
License: GNU General Public License (GPL)
Operating System: Unix/Windows

Mambo is a feature-rich dynamic portal engine/content management tool capable of building sites from several pages to several thousand.

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Developer: Mambo Developers
License: GNU General Public License (GPL)
Operating System: MacOS X, Windows NT/2000, BSD, Linux

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

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