TYPO3 is the world's most used Enterprise Web CMS.
This free, feature rich, Content Management Framework is built with PHP and running under many Unixes and Windows. It offers full flexibility and extendability while featuring an accomplished set of ready-made interfaces, functions and modules.
The back end of TYPO3 has been translated into Khmer by a group of dedicated Cambodian web developers in December 2010.
For more info about TYPO3: http://typo3.org