GeoEngine is an OpenERP module that adds spatial/GIS capabilites to OpenERP. It will allow you to :
GeoEngine relies on OpenLayers and PostgGIS technologies.
Postgis is used to store spatial information in databases. OpenLayer is used to represent spatial data in other words to show maps. The GeoEngine module acts as a data provider and as an OpenLayers configurator. It also provides a complete extension to OpenERP ORM.