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The TYPO3 Project and Community – Open Source CMS
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Moodle - Open-source learning platform | Moodle.org
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Open Source Content Management System : : CMS Made Simple
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eZ Systems Digital Experience Platform (DXP)
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OpenCms, the Open Source Java Web Content Management System
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The most flexible Java CMS | Magnolia Java CMS
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Pimcore - Open Source Digital Experience Platform for Enterprises