Class Tree
A class tree is the arrangement of classes in a tree-like hierarchy. In OOP, each has a parent and possibly children classes. Unreal uses the class Object as the root of the hierarchy. See 
Hierarchy (object-oriented programming) for more.
Unreal 2
Class trees on a single page for Unreal 2:
Unreal Tournament 2003
Class trees on a single page for UT2003:
Some pages have branches of the tree where it's useful to have an overview of all the subclasses. E.g. Material or NavigationPoint.
You can also enter the tree and browse page by page from Object or Actor. Or use the search field on every page to directly enter a class name.
Unreal Tournament
Class trees on a single page for Unreal Tournament:
You can also enter the tree and browse page by page from Object (UT) or Actor (UT). Or use the search field on every page to directly enter a class name.
Categories
Some suggested categories to find class pages and class branch pages. These have not yet been implemented:
- Category Class Tree – pages which contain a class tree or a subbranch
- Category Class (UT2003) – UT2003 class spec pages
- Category Class (UT) – Unreal 1 and Unreal Tournament class spec pages
- [Category Class (U2)]? – Unreal 2 class spec pages
- Category Class (RTNP) – [Return to Na Pali]? class spec pages
- [Category Class (Devastation)]? – Devastation class spec pages
- Category Custom Class – custom class spec pages; usually they also belong to one of the above categories
