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

[detail level 1234]

▼NSisus
▼NInit
▼NEditorOnly
CAnyPropertyDrawer	Custom property drawer for Any<T> that allows assigning any value to the property
▼NReflection
CGameObjectExtensions	Extensions methods for GameObject that can be used to add components with dependencies injected using reflection
CInjectionUtility	Utility class for injecting values to fields and properties during initialization using reflection
▼NSerialization
C_Integer	Represents a simple wrapper for an int value that makes it serializable by Unity's serialization system when assigned to a System.Object type field that has the UnityEngine.SerializeReference attribute
C_String	Represents a simple wrapper for a string value that makes it serializable by Unity's serialization system when assigned to a System.Object type field that has the UnityEngine.SerializeReference attribute
C_Float	Represents a simple wrapper for a float value that makes it serializable by Unity's serialization system when assigned to a System.Object type field that has the UnityEngine.SerializeReference attribute
C_Boolean	Represents a simple wrapper for a bool value that makes it serializable by Unity's serialization system when assigned to a System.Object type field that has the UnityEngine.SerializeReference attribute
C_Double	Represents a simple wrapper for a double value that makes it serializable by Unity's serialization system when assigned to a System.Object type field that has the UnityEngine.SerializeReference attribute
▼NTesting
CTestable	A components that wraps a GameObject and can be used to invoke Unity event functions on components found on the GameObject using reflection
CAny	Represents a value of type T that can be assigned through Unity's inspector as well as serialized by its serializer
CInitOnResetAttribute	When a component that derives from MonoBehaviour<> and has the InitOnResetAttribute is first added to a GameObject in the editor, or when the user hits the Reset button in the Inspector's context menu, the arguments accepted by the component are automatically gathered and passed to its IInitializable<>.Init function
CEditorCoroutine	Represents a coroutine that has been started running in the editor
CEditorCoroutineRunner	Class that can be used for starting and stopping coroutines in the editor even in edit mode
CInitArgumentsNotReceivedException	The exception that is thrown when arguments have been provided for an object being initialized but it fails to receive them
CMissingInitArgumentsException	The exception that is thrown when attempting to create an instance of an object that implements an IArgs<> interface without having provided the arguments that it requires
CGameObjectExtensions	Extensions methods for GameObject that can be used to add components that implement one of the IArgs interfaces with the required dependencies passed to the clone's Init function
CGameObjectT1Extensions	Extensions methods for initializing GameObject<TComponent> objects
CGameObjectT2Extensions	Extensions methods for initializing GameObject<TFirstComponent, TSecondComponent> objects
CGameObjectT3Extensions	Extensions methods for initializing GameObject<TFirstComponent, TSecondComponent, TThirdComponent> objects
CObjectExtensions	Extensions methods for Object that can be used to instantiate new copies Objects that implement one of the IArgs interfaces with the required dependencies passed to the clone's Init function
CSystemObjectExtensions	Extensions methods for all objects that can be used to check that they exist in a way that handles Object.Destroy destroyed Objects properly
CComponents	Represents a pair of components that exist on the same GameObject
CGameObject	Builder for creating a new GameObject with a component of type TComponent
CGameObjectWithInit1Of3Done	Builder for creating a new GameObject with three components
CGameObjectWithInit2Of3Done	Builder for creating a new GameObject with three components
CUninitializedGameObject	Builder for creating a new GameObject with two components
CIInitializer	Represents an object that can can specify the arguments used to initialize objects that implement one of the IInitializable<> interfaces
CInitializer	A base class for a component that can can specify the argument used to initialize an object that implements IInitializable<TArgument>
CWrapperInitializer	A base class for a component that can specify the argument used to initialize an object which then gets wrapped by a Wrapper<TWrapped> component
CIArgs	Represents an object which can receive an argument of type TArgument as part of its initialization process
CIOneArgument	Represents an object which can receive one argument as part of its initialization process
CITwoArguments	Represents an object which can receive two arguments as part of its initialization process
CIThreeArguments	Represents an object which can receive three arguments as part of its initialization process
CIFourArguments	Represents an object which can receive four arguments as part of its initialization process
CIFiveArguments	Represents an object which can receive five arguments as part of its initialization process
CIFirstArgument	Represents an object which can receive at least one argument as part of its initialization process, with the first one being an object of type TFirstArgument
CISecondArgument	Represents an object which can receive at least two arguments as part of its initialization process, with the second one being an object of type TSecondArgument
CIThirdArgument	Represents an object which can receive at least three arguments as part of its initialization process, with the third one being an object of type TThirdArgument
CIFourthArgument	Represents an object which can receive at least four arguments as part of its initialization process, with the fourth one being an object of type TFourthArgument
CIFifthArgument	Represents an object which can receive at least five arguments as part of its initialization process, with the fifth one being an object of type TFifthArgument
CIAwake	Defines a class that wants to receive a callback during the Awake event function of the MonoBehaviour that wraps it
CIFixedUpdate	Defines a class that can subscribe to receive a callback during the FixedUpdate event function
CIInitializable	Represents an object which can be initialized using an argument of type TArgument
CILateUpdate	Defines a class that can subscribe to receive a callback during the LateUpdate event function
CIOnDestroy	Defines a class that wants to receive a callback during the OnDestroy event function of the MonoBehaviour that wraps it
CIOnDisable	Defines a class that wants to receive a callback during the OnDisable event function of the MonoBehaviour that wraps it
CIOnEnable	Defines a class that wants to receive a callback during the OnEnable event function of the MonoBehaviour that wraps it
CIServiceProvider	Represents a class responsible for providing service objects on request to any to any clients that need them
CIStart	Defines a class that wants to receive a callback during the Start event function of the MonoBehaviour that wraps it
CIUpdate	Defines a class that can subscribe to receive a callback during the Update event function
CIValueProvider	Represents an object that can provide a Value of type T on demand
CMonoBehaviour	A base class for MonoBehaviours that can be instantiated or added to a GameObject with an argument passed to the Init function of the created instance
CCreate	Methods that can be used to instantiate new copies Objects that implement one of the IArgs interfaces with the required dependencies passed to the clone's Init function
CScriptableObject	A base class for ScriptableObjects that can be created or instantiated with an argument passed to the Init function of the created instance
CService	Class that can provide a shared instance of any class that has the ServiceAttribute on demand
CEditorServiceAttribute	Classes that have the EditorServiceAttribute can provide services for one or more client objects in the editor in edit mode
CServiceAttribute	Classes that have the ServiceAttribute can provide services for one or more client objects
CServiceProvider	Class that can provide an instance of any class that has the ServiceAttribute on demand
CServiceUtility	Utility class responsible for providing information about services
CUpdater	Class responsible for broadcasting the IUpdate.Update, ILateUpdate.LateUpdate and IFixedUpdate.FixedUpdate events to subscribers during the corresponding Unity event functions
CFind	Utility class for finding instances in the scene
CFlagsValues	Helper class that lists all valid values that an int-backed bit field enumeration type can have.
CInitArgs	Utility class containing methods related to providing and retrieving arguments for objects that implement one of the IArgs interfaces such as MonoBehaviour<TArgument> and ScriptableObject<TArgument>
CICoroutineRunner	Represents an object that can start and stop coroutines running
CICoroutines	Represents an object that can start and stop coroutines
CICoroutinesExtensions	Extension methods for objects that implement ICoroutines
CIWrapper	Represents an Object that acts as a simple wrapper for a plain old class object of type TWrapped
CScriptableWrapper	A base class for ScriptableObjects that act as simple wrappers for plain old class objects
CWrapper	A base class for MonoBehaviours that act as simple wrappers for plain old class objects