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

[detail level 123]

Nsf
NJoystick	Give access to the real-time state of the joysticks
CIdentification	Structure holding a joystick's identification
NListener	The audio listener is the point in the scene from where all the sounds are heard
CCone	Structure defining the properties of a directional cone
CAngle	Represents an angle value
CAudioResource	Base class for classes that require an audio device
CBlendMode	Blending modes for drawing
CCircleShape	Specialized shape representing a circle
CClock	Utility class that measures the elapsed time
CColor	Utility class for manipulating RGBA colors
CContext	Class holding a valid drawing context
CContextSettings	Structure defining the settings of the OpenGL context attached to a window
CConvexShape	Specialized shape representing a convex polygon
CCursor	Cursor defines the appearance of a system cursor
CDrawable	Abstract base class for objects that can be drawn to a render target
CEvent	Defines a system event and its parameters
CClosed	Closed event subtype
CFocusGained	Gained focus event subtype
CFocusLost	Lost focus event subtype
CJoystickButtonPressed	Joystick button pressed event subtype
CJoystickButtonReleased	Joystick button released event subtype
CJoystickConnected	Joystick connected event subtype
CJoystickDisconnected	Joystick disconnected event subtype
CJoystickMoved	Joystick axis move event subtype
CKeyPressed	Key pressed event subtype
CKeyReleased	Key released event subtype
CMouseButtonPressed	Mouse button pressed event subtype
CMouseButtonReleased	Mouse button released event subtype
CMouseEntered	Mouse entered event subtype
CMouseLeft	Mouse left event subtype
CMouseMoved	Mouse move event subtype
CMouseMovedRaw	Mouse move raw event subtype
CMouseWheelScrolled	Mouse wheel scrolled event subtype
CResized	Resized event subtype
CSensorChanged	Sensor event subtype
CTextEntered	Text event subtype
CTouchBegan	Touch began event subtype
CTouchEnded	Touch ended event subtype
CTouchMoved	Touch moved event subtype
CException	Library-specific exception type
CFileInputStream	Implementation of input stream based on a file
CFont	Class for loading and manipulating character fonts
CInfo	Holds various information about a font
CFtp	A FTP client
CDirectoryResponse	Specialization of FTP response returning a directory
CListingResponse	Specialization of FTP response returning a file name listing
CResponse	FTP response
CGlResource	Base class for classes that require an OpenGL context
CTransientContextLock	RAII helper class to temporarily lock an available context for use
CGlyph	Structure describing a glyph
CHttp	A HTTP client
CRequest	HTTP request
CResponse	HTTP response
CImage	Class for loading, manipulating and saving images
CInputSoundFile	Provide read access to sound files
CInputStream	Abstract class for custom file input streams
CIpAddress	Encapsulate an IPv4 network address
CMemoryInputStream	Implementation of input stream based on a memory chunk
CMusic	Streamed music played from an audio file
CSpan	Structure defining a time range using the template type
COutputSoundFile	Provide write access to sound files
CPacket	Utility class to build blocks of data to transfer over the network
CRect	Utility class for manipulating 2D axis aligned rectangles
CRectangleShape	Specialized shape representing a rectangle
CRenderStates	Define the states used for drawing to a RenderTarget
CRenderTarget	Base class for all render targets (window, texture, ...)
CRenderTexture	Target for off-screen 2D rendering into a texture
CRenderWindow	Window that can serve as a target for 2D drawing
CShader	Shader class (vertex, geometry and fragment)
CCurrentTextureType	Special type that can be passed to setUniform(), and that represents the texture of the object being drawn
CShape	Base class for textured shapes with outline
CSocket	Base class for all the socket types
CSocketSelector	Multiplexer that allows to read from multiple sockets
CSound	Regular sound that can be played in the audio environment
CSoundBuffer	Storage for audio samples defining a sound
CSoundBufferRecorder	Specialized SoundRecorder which stores the captured audio data into a sound buffer
CSoundFileFactory	Manages and instantiates sound file readers and writers
CSoundFileReader	Abstract base class for sound file decoding
CInfo	Structure holding the audio properties of a sound file
CSoundFileWriter	Abstract base class for sound file encoding
CSoundRecorder	Abstract base class for capturing sound data
CSoundSource	Base class defining a sound's properties
CCone	Structure defining the properties of a directional cone
CSoundStream	Abstract base class for streamed audio sources
CChunk	Structure defining a chunk of audio data to stream
CSprite	Drawable representation of a texture, with its own transformations, color, etc
CStencilMode	Stencil modes for drawing
CStencilValue	Stencil value type (also used as a mask)
CString	Utility string class that automatically handles conversions between types and encodings
CSuspendAwareClock	Android, chrono-compatible, suspend-aware clock
CTcpListener	Socket that listens to new TCP connections
CTcpSocket	Specialized socket using the TCP protocol
CText	Graphical text that can be drawn to a render target
CTexture	Image living on the graphics card that can be used for drawing
CTime	Represents a time value
CTransform	3x3 transform matrix
CTransformable	Decomposed transform defined by a position, a rotation and a scale
CU8StringCharTraits	Character traits for std::uint8_t
CUdpSocket	Specialized socket using the UDP protocol
CUtf	Utility class providing generic functions for UTF conversions
CVector2	Class template for manipulating 2-dimensional vectors
CVector3	Utility template class for manipulating 3-dimensional vectors
CVertex	Point with color and texture coordinates
CVertexArray	Set of one or more 2D primitives
CVertexBuffer	Vertex buffer storage for one or more 2D primitives
CVideoMode	VideoMode defines a video mode (size, bpp)
CView	2D camera that defines what region is shown on screen
CWindow	Window that serves as a target for OpenGL rendering
CWindowBase	Window that serves as a base for other windows