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

[detail level 1234]

KDTree.AgentTreeNode
AstarColor	Stores editor colors
AstarData	Stores the navigation graphs for the A* Pathfinding System
AstarMath	Utility functions for working with numbers and strings
AstarProfiler
AstarSerializer	Handles low level serialization and deserialization of graph settings and data
AstarSplines	Contains various spline functions
AstarUpdateChecker	Handles update checking for the A* Pathfinding Project
AstarPath.AstarWorkItem
Attribute
CustomGraphEditorAttribute	Added to editors of custom graph types
BBTree	Axis Aligned Bounding Box Tree
BBTree.BBTreeBox
BinaryHeapM	Binary heap implementation
RecastGraph.CapsuleCache
Checksum	Calculates checksums of byte arrays
CompactVoxelCell	CompactVoxelCell used for recast graphs
CompactVoxelSpan	CompactVoxelSpan used for recast graphs
ContourPoint
OptimizationHandler.DefineDefinition
Editor
AstarPathEditor
GraphUpdateSceneEditor	Editor for GraphUpdateScene
AnimationLinkEditor
RaycastModifierEditor
RecastMeshObjEditor
RVONavmeshEditor
RVOSquareObstacleEditor
SmoothModifierEditor
UndoTestEditor
Editor
RVOSimulatorEditor
SeekerEditor
EditorGUILayoutx	Handles fading effects and also some custom GUI functions such as LayerMaskField
EditorUtilities
EditorWindow
AstarUpdateWindow
EuclideanEmbedding	Implements heuristic optimizations
Exception
ThreadControlQueue.QueueTerminationException
ExtraMesh	Represents a custom mesh
EditorGUILayoutx.FadeArea
RecastGraphEditor.GizmoTile	Holds a surface and an outline visualization for a navmesh tile
GraphCollision	Handles collision checking for graphs
GraphEditorBase	Defined here only so non-editor classes can use the target field
GraphEditor
GridGraphEditor
LayerGridGraphEditor
NavMeshGraphEditor
PointGraphEditor
QuadtreeGraphEditor
RecastGraphEditor	Editor for the RecastGraph
PolarGeneratorEditor
GraphHitInfo	Returned by graph ray- or linecasts containing info about the hit
GraphMeta	Metadata for all graphs included in serialization
GraphNode
GridNodeBase	Base class for GridNode and LevelGridNode
GridNode
LevelGridNode	Describes a single node for the LayeredGridGraph
MeshNode
TriangleMeshNode	Node represented by a triangle
PointNode
NodeLink3Node
QuadtreeNode
AstarDebugger.GraphPoint
GraphSerializationContext	Holds information passed to custom graph serializers
GraphUpdateObject	Represents a collection of settings used to update nodes in a specific region of a graph
LayerGridGraphUpdate	GraphUpdateObject with more settings for the LayerGridGraph
GraphUpdateShape	Defines a shape for a Pathfinding.GraphUpdateObject
GraphUpdateUtilities	Contains useful functions for updating graphs
Guid	Simple implementation of a GUID
GUIUtilityx	Simple GUI utility functions
AstarPath.GUOSingle	Holds a single update that needs to be performed on a graph
NRVOAgent.HalfPlane
IAgent	Exposes properties of an Agent class
Agent
IAstarPooledObject
RichPathPart
RichFunnel
RichSpecial
IComparable< Turn >
AdvancedSmooth.Turn	Represents a turn in a path
INavmesh
NavMeshGraph	Generates graphs based on navmeshes
RecastGraph	Automatically generates navmesh graphs based on world geometry
RecastGraph.NavmeshTile
INavmeshHolder
NavMeshGraph	Generates graphs based on navmeshes
RecastGraph	Automatically generates navmesh graphs based on world geometry
RecastGraph.NavmeshTile
Int2	Two Dimensional Integer Coordinate Pair
Int3	Holds a coordinate in integers
IntRect	Integer Rectangle
IPathModifier	Base for all path modifiers
MonoModifier	Base class for path modifiers which can be attached to GameObjects
AdvancedSmooth	Smoothing by dividing path into turns and straight segments
AlternativePath	Applies penalty to the paths it processes telling other units to avoid choosing the same path
FunnelModifier	Simplifies paths on navmesh graphs using the funnel algorithm
RaycastModifier	Simplifies a path using raycasting
SimpleSmoothModifier	Modifier which smooths the path
RadiusModifier	Radius path modifier for offsetting paths
PathModifier	Base class for path modifiers which are not attached to GameObjects
StartEndModifier	Adjusts start and end points of a path
IRaycastableGraph
GridGraph	Generates a grid of nodes
LayerGridGraph	Grid Graph, supports layered worlds
NavMeshGraph	Generates graphs based on navmeshes
RecastGraph	Automatically generates navmesh graphs based on world geometry
ISerializationCallbackReceiver
Seeker	Handles path calls for a single unit
IUpdatableGraph	Graphs which can be updated during runtime
GridGraph	Generates a grid of nodes
LayerGridGraph	Grid Graph, supports layered worlds
NavMeshGraph	Generates graphs based on navmeshes
PointGraph	Basic point graph
RecastGraph	Automatically generates navmesh graphs based on world geometry
JsonConverter
BoundsConverter
GuidConverter
IntKeyDictionaryConverter	Enables json serialization of dictionaries with integer keys
LayerMaskConverter
MatrixConverter
UnityObjectConverter
VectorConverter
KDTree	KD-Tree implementation for rvo agents
Line	ORCA Line
AnimationLink.LinkClip
LinkedLevelCell
LinkedLevelNode
LinkedVoxelSpan
ListPool< T >	Lightweight List Pool
LockFreeStack	Implements a lock free multiple producer - single consumer stack for the Path object
Memory
ObjImporter.meshStruct
MonoBehaviour
AIFollow	Example AI
AILerp	Linearly interpolating movement script
AIPath	AI for following paths
MineBotAI	AI controller specifically made for the spider robot
AstarDebugger	Debugger for the A* Pathfinding Project
AstarPath	Core Component for the A* Pathfinding System
AstarSmoothFollow2	Smooth Camera Following
BezierMover
DoorController
DynamicGridObstacle	Attach this script to any obstacle with a collider to enable dynamic updates of the graphs around it
GroupController	RVO Example Scene Unit Controller
LightweightRVO	Lightweight RVO Circle Example
LocalSpaceGraph	Helper for LocalSpaceRichAI
NRVOController
NRVOCoreSimulator
ObjectPlacer	Small sample script for placing obstacles
DebugUtility	Helper for drawing debug information for the recast graph
GraphModifier	GraphModifier for modifying graphs or processing graph data based on events
GraphUpdateScene	Helper class for easily updating graphs
NodeLink
NodeLink2
AnimationLink
NodeLink3
RVONavmesh	Adds a navmesh as RVO obstacles
MonoModifier	Base class for path modifiers which can be attached to GameObjects
NavmeshAdd	Adds new geometry to a recast graph
NavmeshClamp	Attach to any GameObject and the object will be clamped to the navmesh
NavmeshCut	Navmesh cutting is used for fast recast graph updates
RecastMeshObj	Explicit mesh object for recast graphs
RelevantGraphSurface	Pruning of recast navmesh regions
RichAI	Advanced AI for navmesh based graphs
LocalSpaceRichAI	RichAI for local space (pathfinding on moving graphs)
RVOController	RVO Character Controller
RVOObstacle	Base class for simple RVO colliders
RVOSquareObstacle	Square Obstacle for RVO Simulation
RVOSimulator	Unity front end for an RVO simulator
TargetMover	Moves the target in example scenes
TileHandlerHelper	Helper for navmesh cut objects
UnityReferenceHelper	Helper class to keep track of references to GameObjects
PathTypesDemo	Demos different path types
ProceduralGridMover	Moves a grid graph to follow a target
ProceduralWorld
RecastTileUpdate	Updates the tile(s) it is in at start, needs RecastTileUpdateHandler
RecastTileUpdateHandler	Helper for easier fast updates to recast graphs
RVOAgentPlacer	Places ROV agents in circles
RVOExampleAgent
Seeker	Handles path calls for a single unit
NavGraph	Base class for all graphs
GridGraph	Generates a grid of nodes
NavMeshGraph	Generates graphs based on navmeshes
PointGraph	Basic point graph
QuadtreeGraph
RecastGraph	Automatically generates navmesh graphs based on world geometry
SimpleGraph
NNConstraint	Nearest node constraint
FloodPathConstraint	Restrict suitable nodes by if they have been searched by a FloodPath
PathNNConstraint	A special NNConstraint which can use different logic for the start node and end node in a path
NNInfo
RVOQuadtree.Node
NRVOAgent
ObjectPool< T >	Lightweight object Pool
ObjImporter
KDTree.ObstacleTreeNode
ObstacleVertex	One vertex in an obstacle
OptimizationHandler	Helper for enabling or disabling compiler directives
Path	Base class for all path types
ABPath	Basic path, finds the shortest path from A to B
CustomPath
FloodPathTracer	Traces a path created with the Pathfinding.FloodPath
MultiTargetPath	A path which searches from one point to a number of different targets in one search or from a number of different start points to a single target
RandomPath	Finds a path in a random direction from the start node
FleePath	Returns a path heading away from a specified point to avoid
XPath	Extended Path
ConstantPath	Finds all nodes within a specified distance from the start
FloodPath	Floods the area completely for easy computation of any path to a single point
PathEndingCondition	Customized ending condition for a path
ABPathEndingCondition	Ending condition which emulates the default one for the ABPath
EndingConditionProximity	Ending condition which stops a fixed distance from the target point
EndingConditionDistance	Target is found when the path is longer than a specified value
PathHandler	Handles thread specific path data
PathNode	Stores temporary node data for a single pathfinding request
PathPool	Pools path objects to reduce load on the garbage collector
PathPool< T >	Pools path objects to reduce load on the garbage collector
PathThreadInfo	Holds info about one pathfinding thread
AstarDebugger.PathTypeDebug
PathUtilities	Contains useful functions for working with paths and nodes
Polygon	Utility functions for working with polygons, lines, and other vector math
ProceduralWorld.ProceduralPrefab
ProceduralWorld.ProceduralTile
Profile
AstarProfiler.ProfilePoint
Progress	Progress info for e.g a progressbar
PropertyAttribute
AstarEnumFlagAttribute
PropertyDrawer
AstarEnumFlagDrawer
QuadtreeNodeHolder
RecastBBTree	Axis Aligned Bounding Box Tree
RecastBBTreeBox
RichPath
RVOQuadtree	Quadtree for quick nearest neighbour search of agents
RecastGraph.SceneMesh	Represents a unity mesh to be used in the recast graph rasterization
SerializeSettings	Holds settings for how graphs should be serialized
Simulator	Local Avoidance Simulator
StackPool< T >	Lightweight Stack Pool
TagMask	Holds a tagmask
GridGraph.TextureData	Used for using a texture as a source for a grid graph
ThreadControlQueue	Queue of paths to be processed by the system
TileHandler
TileHandler.TileType
BinaryHeapM.Tuple
AdvancedSmooth.TurnConstructor	Abstract turn constructor
AdvancedSmooth.ConstantTurn	Constant turning speed
AdvancedSmooth.MaxTurn	Type of turn
Utility	*A Pro Feature:** This is an A* Pathfinding Project Pro feature only. This function/class/variable might not exist in the Free version of the A* Pathfinding Project or the functionality might be limited The Pro version can be bought here
VectorMath	Various vector math utility functions
Agent.VO
VoxelArea	*A Pro Feature:** This is an A* Pathfinding Project Pro feature only. This function/class/variable might not exist in the Free version of the A* Pathfinding Project or the functionality might be limited The Pro version can be bought here
VoxelCell	VoxelCell used for recast graphs
VoxelContour	VoxelContour used for recast graphs
VoxelContourSet	VoxelContourSet used for recast graphs
Voxelize	Voxelizer for recast graphs
VoxelMesh	VoxelMesh used for recast graphs
VoxelSpan	VoxelSpan used for recast graphs
WindowsStoreCompatibility
Simulator.Worker
Simulator.WorkerContext