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  jTimeSched 20 Feb 15

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  JXCirrus Project 17 Feb 15

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  BORG Calendar and Task Tracker 27 Sep 15

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  GNOME Schedule 20 Feb 15

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  Calcurse 20 Feb 15

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  phpScheduleIt 3 Jun 15

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  CalDavZAP 17 Feb 15

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  cds-indico 12 May 15