dhtmlxGantt is an open source JavaScript Gantt chart that helps you illustrate a project schedule in a nice-looking chart. It can show the dependencies between tasks as lines and allows you to set up different relationships between tasks (finish-to-start, start-to-start, end-to-end). dhtmlxGantt provides flexible API and a large number of event handles, which gives you the freedom to customize it for your needs.
http://dhtmlx.com/docs/products/dhtmlxGantt
This software is allowed to use under GPL or you need to obtain Commercial or Enterise License to use it in non-GPL project. Please contact sales@dhtmlx.com for details
(c) Dinamenta UAB
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Online documentation http://docs.dhtmlx.com/gantt/
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Support forum http://forum.dhtmlx.com/viewforum.php?f=15