Core
Core ERP5 model (node, path, movement, resource, amount, item)
Document
Default documents based on the ERP5 Core
PropertySheet
Definition of terms which are used all over ERP5
RDF
ERP5 implementation of relations
(should eventually be migrated to ZSQLCatalog)
UI
User interface tools (ERP5 Formulator)
XML
XML interface and synchronisation
OMB
Object Message Bus technology
skins
Default page templates and UI widgets
help
Help documents
www
Various files such as images which are used by products