3 - installable via apt
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5 - no msproject export
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6 - no automatic resource time planning
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7 - easy to add task dependencies via drag and drop on gantt chart
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9 - https://wiki.gnome.org/Apps/Planner
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14 - https://sourceforge.net/projects/openproj/
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18 - active fork of OpenProj
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19 - http://www.projectlibre.org/
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20 - can import and export msproject xml files
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21 - can import Gnome Planner files
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22 - easy to add task dependencies via numbers
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26 - they want an email address for downloading
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27 - http://www.ganttproject.biz/
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