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

[detail level 123]

AudioBusBuffers	Processing buffers of an audio bus
BusInfo	BusInfo: This is the structure used with getBusInfo, informing the host about what is a specific given bus
Chord	Description of a chord
ChordEvent	Chord event specific data
DataEvent	Data event specific data
Event	Event Structure representing a single Event of different types associated to a specific event (kEvent) bus
FrameRate	Frame Rate A frame rate describes the number of image (frame) displayed per second
FUnknown [external]
IPluginBase [external]
IComponent	Component base interface: Vst::IComponent
IEditController	Edit controller component interface: Vst::IEditController
ITest	------------------------------------------------------------------------ ITest interface declaration
ITestFactory	Class factory that any testable module defines for creating tests that will be executed from the host
ITestResult	Test Result message logger [host imp] when a test is called, a pointer to an ITestResult is passed in, so the test class can output error messages
ITestSuite	A collection of tests supporting a hierarchical ordering [host imp] [create via hostclasses]
IInfoListener	Channel context interface: Vst::IInfoListener
IAttributeList	Attribute list used in IMessage and IStreamAttributes: Vst::IAttributeList
IAudioPresentationLatency	Extended IAudioProcessor interface for a component: Vst::IAudioPresentationLatency
IAudioProcessor	Audio processing interface: Vst::IAudioProcessor
IAutomationState	Extended plug-in interface IEditController: Vst::IAutomationState
IComponentHandler	Host callback interface for an edit controller: Vst::IComponentHandler
IComponentHandler2	Extended host callback interface for an edit controller: Vst::IComponentHandler2
IComponentHandler3	Extended host callback interface Vst::IComponentHandler3 for an edit controller
IComponentHandlerBusActivation	Extended host callback interface for an edit controller: Vst::IComponentHandlerBusActivation
IConnectionPoint	Connect a component with another one: Vst::IConnectionPoint
IContextMenu	Context Menu interface: Vst::IContextMenu
IContextMenuTarget	Context Menu Item Target interface: Vst::IContextMenuTarget
IEditController2	Edit controller component interface extension: Vst::IEditController2
IEditControllerHostEditing	Parameter Editing from host: Vst::IEditControllerHostEditing
IEventList	List of events to process: Vst::IEventList
IHostApplication	Basic host callback interface: Vst::IHostApplication
IInterAppAudioConnectionNotification	Extended plug-in interface IEditController for Inter-App Audio connection state change notifications
IInterAppAudioHost	Inter-App Audio host Interface
IInterAppAudioPresetManager	Extended plug-in interface IEditController for Inter-App Audio Preset Management
IKeyswitchController	Extended plug-in interface IEditController for key switches support: Vst::IKeyswitchController
IMessage	Private plug-in message: Vst::IMessage
IMidiLearn	MIDI Learn interface: Vst::IMidiLearn
IMidiMapping	MIDI Mapping interface: Vst::IMidiMapping
INoteExpressionController	Extended plug-in interface IEditController for note expression event support: Vst::INoteExpressionController
INoteExpressionPhysicalUIMapping	Extended plug-in interface IEditController for note expression event support: Vst::INoteExpressionPhysicalUIMapping
IParameterChanges	All parameter changes of a processing block: Vst::IParameterChanges
IParameterFinder	Extension for IPlugView to find view parameters (lookup value under mouse support): Vst::IParameterFinder
IParameterFunctionName	Edit controller component interface extension: Vst::IParameterFunctionName
IParamValueQueue	Queue of changes for a specific parameter: Vst::IParamValueQueue
IPlugInterfaceSupport	Host callback interface for an edit controller: Vst::IPlugInterfaceSupport
IPrefetchableSupport	Indicates that the plug-in could or not support Prefetch (dynamically): Vst::IPrefetchableSupport
IProcessContextRequirements	Extended IAudioProcessor interface for a component: Vst::IProcessContextRequirements
IProgramListData	Component extension to access program list data: Vst::IProgramListData
IProgress	Extended host callback interface for an edit controller: Vst::IProgress
IStreamAttributes	Meta attributes of a stream: Vst::IStreamAttributes
ITestPlugProvider	Test Helper
ITestPlugProvider2	Test Helper extension
IUnitData	Component extension to access unit data: Vst::IUnitData
IUnitHandler	Host callback for unit support: Vst::IUnitHandler
IUnitHandler2	Host callback for extended unit support: Vst::IUnitHandler2
IUnitInfo	Edit controller extension to describe the plug-in structure: Vst::IUnitInfo
IVst3ToAAXWrapper	VST 3 to AAX Wrapper interface: Vst::IVst3ToAAXWrapper
IVst3ToAUWrapper	VST 3 to AU Wrapper interface: Vst::IVst3ToAUWrapper
IVst3ToVst2Wrapper	VST 3 to VST 2 Wrapper interface: Vst::IVst3ToVst2Wrapper
IVst3WrapperMPESupport	Wrapper MPE Support interface: Vst::IVst3WrapperMPESupport
IXmlRepresentationController	Extended plug-in interface IEditController for a component: Vst::IXmlRepresentationController
IContextMenuItem	IContextMenuItem is an entry element of the context menu
KeyswitchInfo	KeyswitchInfo is the structure describing a key switch This structure is used by the method IKeyswitchController::getKeyswitchInfo
LegacyMIDICCOutEvent	Legacy MIDI CC Out event specific data
NoteExpressionTextEvent	Note Expression Text event
NoteExpressionTypeInfo	NoteExpressionTypeInfo is the structure describing a note expression supported by the plug-in
NoteExpressionValueDescription	Description of a Note Expression Type This structure is part of the NoteExpressionTypeInfo structure, it describes for given NoteExpressionTypeID its default value (for example 0.5 for a kTuningTypeID (kIsBipolar: centered)), its minimum and maximum (for predefined NoteExpressionTypeID the full range is predefined too) and a stepCount when the given NoteExpressionTypeID is limited to discrete values (like on/off state)
NoteExpressionValueEvent	Note Expression Value event
NoteOffEvent	Note-off event specific data
NoteOnEvent	Note-on event specific data
ParameterInfo	Controller Parameter Info
PhysicalUIMap	PhysicalUIMap describes a mapping of a noteExpression Type to a Physical UI Type
PhysicalUIMapList	PhysicalUIMapList describes a list of PhysicalUIMap
PolyPressureEvent	PolyPressure event specific data
ProcessContext	Audio processing context
ProcessData	Any data needed in audio processing
ProcessSetup	Audio processing setup
ProgramListInfo	Basic Program List Description
RepresentationInfo	RepresentationInfo is the structure describing a representation This structure is used in the function
RoutingInfo	Routing Information: When the plug-in supports multiple I/O busses, a host may want to know how the busses are related
ScaleEvent	Scale event specific data
UnitInfo	Basic Unit Description