ERP5 is a free Enterprise Resource Planning system based on the Zope application server. It is mainly developed in the Python programming language and the source code is freely available under the GNU General Public License. ERP5 is developed by the French company Nexedi which also offers consulting, customizations and training for ERP5. There are currently two version of ERP5:
ERP5 Enterprise is used in enterprise level customer projects which are mainly focused on custom development and customizations based on the individual business processes of the company.
ERP5 Express is a hosted solution offered as Software as a Service for a monthly fee which is standardized for the typical needs of small companies. It offers HR and CRM functionality and Accounting and Document Management features will be added at the beginning of 2008.

Web Site
Demo
Download