This site demonstrates via the OOE module an object-oriented bridge to Drupal7 core

'OOE' can stand for Object Oriented Examples, and this site demonstrates via OOE = Object Oriented Examples = One Of Each an object-oriented bridge to Drupal7 core, including consistent graphical UML analysis diagrams of the OOE system. (A sibling site will later create an OO bridge to Drupal8, which unfortunately under the hood still codes directly against structured arrays, despite some progress towards more OOP).