"Belgium-based OpenERP provides an open source suite of ERP
business applications. It follows a typical commercial open source
business model where the fully-featured applications are available
free through a community-supported version; however no warranties
or support for the software is available from the company.
"If you choose the Enterprise or Online versions your business
can obtain support for the software in addition to migration and
maintenance, on a per-user, per-month subscription basis.
"While not necessarily encouraged, OpenERP does include a
provision in the OpenERP Enterprise license that allows customers
to make private OpenERP modules when they need to."