Here is a list of all documented files with brief descriptions:

[detail level 12]

src
api.cpp	Krig Game Engine Lua Scripting API
api.h
api_camera.cpp	Krig Game Engine Lua Scripting API - Camera
api_camera.h
api_engine.cpp	Krig Game Engine Lua Scripting API - Game (Engine)
api_engine.h
api_level.cpp	Krig Game Engine Lua Scripting API - Game Level
api_level.h
api_object.cpp	Krig Game Engine Lua Scripting API - Game Object
api_object.h
api_rotation.h
api_terrain.cpp	Krig Game Engine Lua Scripting API - Terrain
api_terrain.h
api_vector.cpp	Krig Game Engine Lua Scripting API - Rotation Library
api_vector.h
buffer.h
Camera.h	Camera management
constants.h
DisplayList.h	Maintains a list of viewable QuadTreeNodes
Engine.h	Containing class for all game engine management
Frustum.h	Representation of the view's Frustum
GameLevel.h	Representation of a game level or scene
gametimer.h
KeyState.h	Lookup state of all keyboard keys
krig_game_engine.h
LuaGL.h
main.cpp	Engine initialization, IO, and window setup
Matrix.h	Representation of 4x4 matrix with common matrix operations
ModelGameObject.h	A game object represented by a model
Music.h	Load and play songs
Object.h	Base game object from which all concrete types are defined
ObjectList.h	Create a linked list of game objects
ObjectNode.h	A game object link in the game list linked list
ParticleSystem.h	Base class from which all concrete particle systems are derived
Plane.h	Representation of a plane
QuadTree.h	Representation of a quadtree
QuadTreeNode.h	Definition of a quatree node containing min and max coordinates
Quaternion.h	Quaternion representation for 3D rotations
Snow.h	Snow particle system
SoundFX.h	Load and play sounds
Sphere.h	Represent and operate on a sphere
SpriteGameObject.h	Manage 2D sprite (texture)-based game objects
StarField.h	Star field particle system
Terrain.h	Generate and manage terrain game objects
TerrainEditor.h	Operations for displaying and interfacing with the terrain editor
TextGameObject.h	Text based game object
Vector.h	Represent and operate on vectors