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

[detail level 123]

base
gfx
webdriver
internal
RouteDetails
AlertTextCommand	Gets the message of the JavaScript modal dialog, or sets the prompt text
AcceptAlertCommand
DismissAlertCommand
AppCacheStatusCommand
BrowserConnectionCommand
CISCO_VolumeCommand
CISCO_StateCommand
CISCO_SeekCommand
CISCO_MuteCommand
CISCO_PlaybackSpeedCommand
Command
CookieCommand
NamedCookieCommand
CreateSession
ElementCommand
ElementAttributeCommand
ElementClearCommand
ElementCssCommand
ElementDisplayedCommand
ElementEnabledCommand
ElementEqualsCommand
ElementLocationCommand
ElementLocationInViewCommand
ElementNameCommand
ElementSelectedCommand
ElementSizeCommand
ElementSubmitCommand
ElementValueCommand
ElementTextCommand
ElementScreenshotCommand
ExecuteAsyncScriptCommand
ExecuteCommand
FindElementCommand
FindOneElementCommand
FindManyElementsCommand
HTML5LocationCommand
LocalStorageCommand
LocalStorageKeyCommand
LocalStorageSizeCommand
SessionStorageCommand
SessionStorageKeyCommand
SessionStorageSizeCommand
KeysCommand	Send a sequence of key strokes to the page
LogCommand
LogTypesCommand
MoveAndClickCommand
HoverCommand
AdvancedMouseCommand
MoveToCommand
ClickCommand
ButtonDownCommand
ButtonUpCommand
DoubleClickCommand
WheelCommand
ForwardCommand
BackCommand
RefreshCommand
StatusCommand
GlobalLogCommand	Sends global logs
OrientationCommand
Response
ScreenshotCommand
SessionWithID
Sessions
SetTimeoutCommand
SetAsyncScriptTimeoutCommand	Set timeout for asynchronous script execution (/session/*/execute_async)
ImplicitWaitCommand	Set the amount of time the driver should wait when searching for elements
SourceCommand
WindowHandleCommand
WindowHandlesCommand
WindowCommand
SwitchFrameCommand
ActiveElementCommand	Retrieves the active element on the current page
TitleCommand
TouchCommand
TouchClickCommand
TouchDownCommand
TouchUpCommand
TouchDoubleClickCommand
TouchMoveCommand
TouchScrollCommand
TouchLongClickCommand
TouchFlickCommand
TouchPinchRotateCommand	Rotate element using pinch rotate fingers motion events
TouchPinchZoomCommand	Rotate element using pinch zoom fingers motion events
URLCommand
VisualizerSourceCommand	Get the page source with reference artifacts assembled inside
VisualizerShowPointCommand
WebDriverCommand
ViewCommand	Handles commands that interact with current view
WindowSizeCommand
WindowPositionCommand
WindowMaximizeCommand
XDRPCCommand
QDeclarativeItemViewHandle
GraphicsWebViewEnumeratorImpl	Class for QDeclarativeWebView enumerator
GraphicsWebViewCmdExecutorCreator
GraphicsWebViewCmdExecutor
GraphicsWebViewHandle
QSessionLifeCycleActions
QViewCmdExecutor	Base class for QT based view's implementation
QTaskRunner
QViewRunner
QQmlViewCreator	Base class for custom view's creators
QmlViewEnumeratorImpl	Class for QWebView enumerator
QQmlViewCmdExecutorCreator
QQmlViewCmdExecutor	QDeclarativeView based view's implementation
QmlWebViewEnumeratorImpl	Class for QDeclarativeWebView enumerator
QmlWebViewCmdExecutorCreator
QmlWebViewCmdExecutor
Quick2ViewCreator
Quick2ViewEnumeratorImpl
Quick2ViewCmdExecutorCreator
Quick2ViewCmdExecutor
QWindowViewCmdExecutor	Base class for QT5 QWindow based views
QWindowViewHandle
QWebViewCreator	Base class for custom view's creators
WebViewEnumeratorImpl	Class for QWebView enumerator
QWebViewCmdExecutorCreator
QWebViewCmdExecutor	QWebView based view's implementation
QElementHandle
QWidgetViewCreator	Base class for custom view's creators
WidgetViewEnumeratorImpl	Class for QWebView enumerator
QWidgetViewCmdExecutorCreator
QWidgetViewCmdExecutor	QWebView based view's implementation
QViewHandle
FramePath
VersionInfo	This class contains information about version webdriver
AccessValidator	Provides IP/command whitelist functionality
Point
Size
Rect
Capabilities
CapabilitiesParser
ElementHandle	This class represents a Webdriver Element handle. Custom implementation should inherit and implement
ElementId
LocatorType
Error	Represents a WebDriver error and the context within which the error occurred
LogType	Represents a type/source of a WebDriver log
LogHandler	Base class for log handlers
FileLog	File log handler
StdOutLog	Stdout log handler
InMemoryLog
PerfLog
Logger	Forwards logging messages to added logs
GlobalLogger	Logs some messages int oglobal FileLog and StdOutLog
CommandRoutes	This class contains constants for standard commands routes
AbstractCommandCreator	Base class for command creator
CommandCreator
RouteTable
DefaultRouteTable	Subclass of RouteTable with default WD commands set
Server
Session
SessionLifeCycleActions
SessionManager
Switches
ValueParser	Parses a given value
DirectValueParser
AbstractViewEnumeratorImpl	Base class for view enumerator
ViewEnumerator
ViewCmdExecutor	Base class for custom view's executors
ViewCmdExecutorCreator	Base class for custom cmd executor creators
ViewCmdExecutorFactory	This class used for managing commands related to view
ViewCreator	Base class for custom view's creators
ViewFactory	This class used for creating new views
ViewHandle
ViewId	This class represents a Webdriver View ID. These IDs are mapped to objects in a page
ViewRunner
URLTransitionAction
URLTransitionAction_CloseOldView	Transition action - close old view
ViewTransitionManager
EventDispatcher	Abstract class which provides interface for event dispatchers
GraphicsWebView
QDeclarativeItem
QDeclarativeWebPage
QDeclarativeWebSettings
QDeclarativeWebView
QDeclarativeWebViewAttached
QGraphicsWebView
QNetworkAccessManager
QNetworkAccessManagerTracer
QObject
QWebPage
QWebView
QWebViewExt
ServerParameters
PIXEL_FORMAT
ValueConversionTraits
ValueConversionTraits< base::DictionaryValue * >
ValueConversionTraits< base::ListValue * >
ValueConversionTraits< base::Value * >
ValueConversionTraits< bool >
ValueConversionTraits< double >
ValueConversionTraits< int >
ValueConversionTraits< std::string >
ValueConversionTraits< webdriver::ElementId >
ValueConversionTraits< webdriver::Point >
ValueConversionTraits< webdriver::Rect >
ValueConversionTraits< webdriver::Size >
ValueConversionTraits< webdriver::SkipParsing >
VNCClient
VNCEventDispatcher	This class dispatch events to VNC module
WDEventDispatcher	This class contains dispathers chain