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

[detail level 12345]

▼NGearLib
▼NAPI
▼NFields
CBooleanField	A Boolean property for your Behaviour
CFloatField	A Float property for your Behaviour
CIField	Interface for adding properties to their Part Behaviour in game for players. This uses the built-in existing properties available on Parts to customize them. MODDERS: Do not use this. Instead, use the other fields inheriting from this. Example below on how to use these fields: [IntField(label = "Timing", tooltip_text = "Offset degrees from TDC to fire piston", initial_value = 5, minimum_value = -30, maximum_value = 30)] public int timing;
CInputField	A Input property for your Behaviour. This is for Keyboard inputs
CIntField	A Integer property for your Behaviour
CJoystickField	A Joystick property for your Behaviour. Utilizes the base game functionality with controllers
CStringField	A String property for your Behaviour
▼NLua
▼NTweakables
CLuaInputAction
CLuaAttachment
CLuaCollider
CLuaConstruction
CLuaDataChannel
CLuaDataChannelValue
CLuaDebug
CLuaPart
CLuaRigidbody
CLuaScript
CLuaTransform
CLuaVariables
CLuaVector3
CBehaviour	Base class for a Behaviour to attach to your Part. Ideal usage is inheriting from this class (public class MyBehaviour : Behaviour {})
CLinkType	Base class for a new Link Type in the game. Allows your mod Parts to connect together
CMaterial
CPart	Base class to use when creating a new Part. These can be created using: Part new_part = new Part(args); or by inheriting like so: class NewPart : Part { public NewPart() : base(args) { // Your code here } }