Here is a list of all topics with brief descriptions:

Action Classes	Actions are objects that traverse a scene graph to drive some scene-related process
Base Classes	This group is just a lot of basic types for linear algebra, string manipulation and misc. other utilities
Bundle Classes	The bundle classes are internal to Coin
Cache Classes	The cache classes are internal to Coin
Detail Classes	Detail classes are objects that deliver additional information wherever the SoPrimitiveVertex class is used
Dragger Classes	Draggers are interactive components in the scene graph that respond to, and are controlled by mouse and keyboard events
Element Classes	The element classes in Coin are the containers of state information during action traversals of scene graphs
Engine Classes	Engines are scene based objects that convert between field values of various types or performs computations on them
Error Handling Classes	The error classes are static classes that contain a callback pointer for handling errors of the given type
Event Classes	These classes are the event types you can send to a scene graph through the SoHandleEventAction
Field Classes	The fields are the data containers in the scene graph. Nodes and engines all use fields to store their public data
Miscellaneous Classes
Manipulator Classes	Manipulators are objects you can swap back and forth into a scene graph at locations where you have an SoTransform node
Navigation Classes	These contains the actual implementation of the ScXML based navigation system
NodeKit Classes	Nodekits modularize sub-structures of a scene graph
Node Classes	Nodes are scene based objects performs various actions such as rendering
Projector Classes	The projector classes are used to convert between screen space (2D) locations and locations in world space (3D).
Sensor Classes	Sensors are objects that monitor other objects for changes and invoke callbacks when changes occur
Shader Classes	Shaders are programs that run on the graphics processor and replace the formerly fixed OpenGL pipeline
Coin specific State Chart XML Classes	This set of classes implement a Coin specific mode of scxml
3D Sound Support Classes
State Chart XML Classes	This set of classes is a basic implementation of State Chart XML
Portable Threads Abstraction Classes
VRML97 Classes	Nodes implementing the VRML97 standard
Vectorized Printing Classes	The vectorized printing classes are for rendering to vector devices instead of raster devices.
XML related functions and objects	Coin now has its own XML parser that also can be used from client code
Scene Graph Profiling	Coin includes some scene graph profiling functionality
Miscellaneous Macros	When extending Coin, there are a number of macros one needs to know about and use
Miscellaneous Environment Variables	Various aspects of the Coin runtime behaviour can be controlled through setting different environment variables to some value
Misc	Miscellaneous
Internal	Internal code