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

Csf::AudioResource	Abstract base class for every class that owns a device-dependant resource – allow them to initialize / shutdown even when the audio context is not created
Csf::Sound	Sound defines the properties of a sound such as position, volume, pitch, etc
Csf::SoundStream	SoundStream is a streamed sound, ie samples are acquired while the sound is playing
Csf::Music	Music defines a big sound played using streaming, so usually what we call a music :)
Csf::SoundBuffer	SoundBuffer is the low-level for loading and manipulating sound buffers
Csf::SoundStream::Chunk	Structure defining a chunk of audio data to stream
Csf::Clock	Clock is an utility class for manipulating time
Csf::Color	Color is an utility class for manipulating 32-bits RGBA colors
Csf::Drawable	Abstract base class for every object that can be drawn into a render window
Csf::PostFX	PostFX is used to apply a post effect to a window
Csf::Shape	Shape defines a drawable convex shape ; it also defines helper functions to draw simple shapes like lines, rectangles, circles, etc
Csf::Sprite	Sprite defines a sprite : texture, transformations, color, and draw on screen
Csf::String	String defines a graphical 2D text, that can be drawn on screen
Csf::Event	Event defines a system event and its parameters
Csf::Glyph	Structure describing a glyph (a visual character)
Csf::IPAddress	IPAddress provides easy manipulation of IP v4 addresses
Csf::Event::JoyButtonEvent	Joystick buttons events parameters
Csf::Event::JoyMoveEvent	Joystick axis move event parameters
Csf::Event::KeyEvent	Keyboard event parameters
Csf::Listener	Listener is a global interface for defining the audio listener properties ; the audio listener is the point in the scene from where all the sounds are heard
Csf::Matrix3	Utility class to manipulate 3x3 matrices representing 2D transformations
Csf::Event::MouseButtonEvent	Mouse buttons events parameters
Csf::Event::MouseMoveEvent	Mouse move event parameters
Csf::Event::MouseWheelEvent	Mouse wheel events parameters
Csf::NonCopyable	Utility base class to easily declare non-copyable classes
Csf::Context	Class wrapping an OpenGL context
Csf::Ftp	This class provides methods for manipulating the FTP protocol (described in RFC 959)
Csf::Http	This class provides methods for manipulating the HTTP protocol (described in RFC 1945)
Csf::Input	Input handles real-time input from keyboard and mouse
Csf::Lock	Lock is an exception-safe automatic wrapper for locking and unlocking mutexes
Csf::Mutex	Mutex defines a mutex (MUTual EXclusion) object, that allows a thread to lock critical instructions to avoid simultaneous access with other threads
Csf::Thread	Thread defines an easy way to manipulate a thread
Csf::SoundRecorder	SoundRecorder is an interface for capturing sound data, it is meant to be used as a base class
Csf::SoundBufferRecorder	Specialized SoundRecorder which saves the captured audio data into a sound buffer
Csf::SoundStream	SoundStream is a streamed sound, ie samples are acquired while the sound is playing
Csf::Window	Window is a rendering window ; it can create a new window or connect to an existing one
Csf::RenderWindow	Simple wrapper for sf::Window that allows easy 2D rendering
Csf::Packet	Packet wraps data to send / to receive through the network
Csf::Randomizer	Randomizer is an utility class for generating pseudo-random numbers
Csf::Rect< T >	Rect is an utility class for manipulating rectangles
Csf::RenderTarget	Base class for all render targets (window, image, ...)
Csf::RenderWindow	Simple wrapper for sf::Window that allows easy 2D rendering
Csf::Http::Request	This class wraps an HTTP request, which is basically :
Csf::Resource< T >	Base class for every resource that needs to notify dependent classes about its destruction
Csf::Resource< Font >
Csf::Font	Font is the low-level class for loading and manipulating character fonts
Csf::Resource< Image >
Csf::Image	Image is the low-level class for loading and manipulating images
Csf::Resource< SoundBuffer >
Csf::SoundBuffer	SoundBuffer is the low-level for loading and manipulating sound buffers
Csf::ResourcePtr< T >	Safe pointer to a T resource (inheriting from sf::Resource<T>), its pointer is automatically reseted when the resource is destroyed
Csf::Ftp::Response	This class wraps a FTP response, which is basically :
Csf::Ftp::DirectoryResponse	Specialization of FTP response returning a directory
Csf::Ftp::ListingResponse	Specialization of FTP response returning a filename lisiting
Csf::Http::Response	This class wraps an HTTP response, which is basically :
Csf::SelectorBase	Private base class for selectors
Csf::Selector< SocketUDP >
Csf::Selector< SocketTCP >
Csf::Selector< Type >	Selector allow reading from multiple sockets without blocking
Csf::Event::SizeEvent	Size events parameters
Csf::SocketHelper	This class defines helper functions to do all the non-portable socket stuff
Csf::SocketTCP	SocketTCP wraps a socket using TCP protocol to send data safely (but a bit slower)
Csf::SocketUDP	SocketUDP wraps a socket using UDP protocol to send data fastly (but with less safety)
Csf::Unicode::Text	This class is an abstract definition of a unicode text, it can be converted from and to any kind of string and encoding
Csf::Event::TextEvent	Text event parameters
Csf::Unicode	Provides utility functions to convert from and to any unicode and ASCII encoding
Csf::Vector2< T >	Vector2 is an utility class for manipulating 2 dimensional vectors
Csf::Vector3< T >	Vector3 is an utility class for manipulating 3 dimensional vectors
Csf::VideoMode	VideoMode defines a video mode (width, height, bpp, frequency) and provides static functions for getting modes supported by the display device
Csf::View	This class defines a view (position, size, etc.) ; you can consider it as a 2D camera
Csf::WindowListener	Base class for classes that want to receive events from a window (for internal use only)
Csf::Input	Input handles real-time input from keyboard and mouse
Csf::Window	Window is a rendering window ; it can create a new window or connect to an existing one
Csf::WindowSettings	Structure defining the creation settings of windows