OpenERP is a comprehensive suite of business applications including Sales, CRM, Project management, Warehouse management, Manufacturing, Accounting, Human Resources, etc. More than 2000 modules available on http://openerp.com.
OpenERP can be used onsite or through a remote access. All the customer need is a web browser or the OpenERP GTK client. Change in workflows and search views or reports can be design without any hard coding in the software. The user interface has been designed to make navigation though the software simple and intuitive.