Everything is a plugin in qcadoo
Therefore everything can be modified by another plugin. The data model, the business logic and the GUI as illustrated below.
Plugin development topics
JavaDoc is available on: javadoc.qcadoo.org
At http://doc.qcadoo.org/master and http://doc.qcadoo.org/dev you can find interactive models documentation (respectively for versions from master and dev git's branches).
These documents are automatically generated using MessBuster, an open-source qcadoo documentation generator, available here: https://github.com/mkubala/messBuster