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Moodle - Open-source learning platform | Moodle.org
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LinuxCommand.org: Learn the Linux command line. Write shell scripts.
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ERP Solution - Enterprise Resource Planning - TUHUND ERP
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grml.org - Debian Live system / CD for sysadmins and texttool-users
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The GNU Operating System
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TicketSpice | Powerful Ticketing System To Sell Tickets Online
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Learning Management System