Unlike some “dual license” projects, OpenERP provides only one edition of the software. Commercial versions add maintenance and support. The advantage of this business model is that you can start off with the professional version, then move back to the community version merely by dropping the services. (This is not typically possible with the dual-license model because different versions of the database make it impossible to “downgrade.”) OpenERP is built on a Python framework that’s easy to customize and extend. There are tons of third-party add-ons, almost all of which are free.– Fred Blauer
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