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Drupal - Open Source CMS | Drupal.org
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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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The Web's Largest Community Tracking Online Fraud & Abuse | Project Honey Pot
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Open Source Communications Software | Asterisk Official Site
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Linphone open source VoIP SIP softphone - voice, video and instant messaging
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Homepage - BackBox.org