OpenERP was known in the past as Tiny and later TinyERP as an OSS project by Fabien "Pinky" Pinckaers. It is an ERP system that covers all aspects of typical companies and 95% of all aspects of all companies. It is written in Python and licensed under the GPL.
openerpserver:/usr/src#aptitude install python-pychart python-imaging python-lxml \ python-xml postgresql postgresql-plpython python-tz python-pygraphvis \ python-psycopg2 python-reportlab python-pydot python-egenix-mxdatetime \ python-vobject python-matplotlib
Setup Postgresql with the following:
#su postgre $createuser -P -d -r -s openerp
In /etc/postgresql/8.3/main/pg_hda.conf change the authentication method from Ident to password on local. There is a lot of work to setting up and managing a database so get a DBA on hand.