Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

GammaRay
ObjectBroker	Retrieve/expose objects independent of whether using in-process or out-of-process UI
ObjectMethodModelRole	Custom roles for GammaRay::ObjectMethodModel
ObjectModel	GammaRay Object Models
PropertyWidgetDisplayState	Display mode settings of the property widget
Protocol	Helper functions and constants defining the communication protocol between client and server
ToolModelRole	Custom roles for GammaRay::ToolModel
Util	GammaRay utilities
VariantHandler	Variant conversion functions, extendable by plugins
DeferredResizeModeSetter	Sets the resize mode on a QHeaderView section once that section is actually available
DeferredTreeViewConfiguration	A utility helper to configure views for remote content
Endpoint	Network protocol endpoint
MetaObject	Compile-time introspection adaptor for non-QObject classes
MetaObjectImpl	Template implementation of MetaObject
MetaObjectRepository	MetaObject repository
ObjectFilterProxyModelBase	A QSortFilterProxyModel for generic Objects
ObjectModelBase	A container for a generic Object Model derived from some Base
ObjectTypeFilterProxyModel	A templated generic ObjectFilterProxyModelBase for some data type
PaletteModel	Model showing the content of a QPalette
ProbeInterface	An abstract interface for accessing the core GammaRay probe
PropertyController	Non-UI part of the property widget
PropertyControllerInterface	Client/Server interface of the property editor
PropertyWidget	Client-side counter-part GammaRay::PropertyController
SingleColumnObjectProxyModel	A QIdentityProxyModel for generic Objects
StandardToolFactory	A templated generic ToolFactory for some data type and tool
StandardToolFactory2	A templated generic ToolFactory for some data type and Tool
StandardToolUiFactory	A templated convenience ToolUiFactory applicable for most use-cases
ToolFactory	An abstract interface for probe tools
ToolUiFactory	An abstract interface for creating the UI parts of probe tools