The software is open source and is released under the GNU General Public License. The Linux user interface is GTK+ based. Windows and Mac OS X versions also available. A web interface ETiny is also available using the Turbogears web framework. Since 2008, a KDE user interface is also available. The latest version of Open ERP (5.0) provides dynamic Gantt charts (with drag&drop), shared calendars, an integrated BPM view, a workflow editor and a screen designer. Open ERP is known to be very complete and extremely modular, with 350 available modules. It is based on a strong MVC architecture, with a distributed server, flexible workflows, an object database, a dynamic GUI, an XML-RPC interface, and customizable reports

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