This inheritance list is sorted roughly, but not completely, alphabetically:

CCLO3D::BaseCommand
CCLO3D::BaseCommandArguments
CBaseDialog
CCLO3D::UI::CommandDialog
CCLO3D::UI::ExtensionsSettingsDialog
CCLO3D::BaseExtension
CCLO3D::BaseExtensionSettings
CCLO3D::BaseLocalServerListener
CCLO3D::BaseNativeShortcutHandler
CCLO3D::BaseTask
CCLO3D::Task
CCLO3D::TaskGroup
CCLO3D::CommandRunner
Cstd::exception
CCLO3D::BaseTaskException
CCLO3D::TaskException
CCLO3D::TaskGroupException
CCLO3D::ExtensionsManager
CCLO3D::ExtensionsSettings
CCLO3D::LocalServer
CNamedWidget
CCLO3D::UI::BaseExtensionSettingsWidget
CQAbstractListModel
CCLO3D::UI::BaseModel< T >
CQFuture< T >
CQFutureWatcher< T >
CQKeySequenceEdit
CCLO3D::UI::KeySequence
CQObject
CPaintFilter
CQOpenGLWidget
COpenGLWidget
CQStyledItemDelegate
CCLO3D::UI::BaseDelegate< W, C >
CQWidget
CCLO3D::UI::BaseCommandArgumentsWidget
CCLO3D::TaskExecutor