The AppTools project includes a set of packages that Enthought has found useful in creating a number of applications. They implement functionality that is commonly needed by many applications

* enthought.appscripting: Framework for scripting applications.

* enthought.help: Provides a plugin for displaying documents and
  examples and running demos in Envisage Workbench applications.

* enthought.io: Provides an abstraction for files and folders in a
  file system.

* enthought.naming: Manages naming contexts, supporting non-string
  data types and scoped preferences

* enthought.permissions: Supports limiting access to parts of an
  application unless the user is appropriately authorised (not
  full-blown security).

and many more.