ERP5 is based on 5 generic concepts hence the name ERP5.
These five concepts are used to build the core architecture and all
extensions making ERP5 a very flexible system for
modelling complex business processes.
Building ERP5 is like working with 5 generic lego stones instead of
prebuilt parts, that are only usable in a certain way: ERP5 allows to build
company-specific solutions around existing processes
instead of forcing a company to change and adopt a software's
ERP5 is split into a core and business templates (called bt5), which cover
a wide functional scope and can be installed as needed. Enabling
accounting for example requires adding the bt5s
"erp5_accounting" and one containing the account scheme to use
ERP5 is published under GLP licence. It can be downloaded and used for free,
has active implementations running for over 10 years and
constantly evolves through test based development.
Nexedi provides services (along with training) to customize ERP5
and extend bt5s (like erp5_accounting) to specific company requirements
(reports, controlling, third-party interfaces).