TYPO3 - Open Source Content Management Framework

http://typo3.com –

"TYPO3 is a small to midsize enterprise-class Content Management Framework offering the best of both worlds: out-of-the-box operation with a complete set of standard modules and a clean and sturdy high-performance architecture accomodating virtually every kind of custom solution or extension. For authors, TYPO3 is a user-friendly, intuitive tool, allowing content editors to produce and maintain web pages, using sophisticated functions in just a few clicks of the mouse."

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