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

[detail level 123]

NGeographicLib	Namespace for GeographicLib
Nexperimental	Namespace for experimental components of GeographicLib
CTriaxialGeodesicODE	The ODE solution of direct geodesic problem for triaxial ellipsoids
NTriaxial	Namespace for operations on triaxial ellipsoids
CCartesian3	Transformations between Cartesian and triaxial coordinates
CConformal3	Jacobi's conformal projection of a triaxial ellipsoid
CEllipsoid3	A triaxial ellipsoid
CGeodesic3	The solution of the geodesic problem for a triaxial ellipsoid
CGeodesicLine3	The direct geodesic problem for a triaxial ellipsoid
CAccumulator	An accumulator for sums
CAlbersEqualArea	Albers equal area conic projection
CAngleT	An accurate representation of angles
CAuxAngle	An accurate representation of angles
CAuxLatitude	Conversions between auxiliary latitudes
CAzimuthalEquidistant	Azimuthal equidistant projection
CCassiniSoldner	Cassini-Soldner projection
CCircularEngine	Spherical harmonic sums for a circle
CConstants	Constants needed by GeographicLib
CDAuxLatitude	Divided differences of auxiliary latitudes
CDMS	Convert between degrees and the DMS representation
CDST	Discrete sine transforms
CEllipsoid	Properties of an ellipsoid
CEllipticFunction	Elliptic integrals and functions
CGARS	Conversions for the Global Area Reference System (GARS)
CGeocentric	Geocentric coordinates
CGeoCoords	Conversion between geographic coordinates
CGeodesic	Geodesic calculations
CGeodesicExact	Exact geodesic calculations
CGeodesicLine	A geodesic line
CGeodesicLineExact	An exact geodesic line
CGeographicErr	Exception handling for GeographicLib
CGeohash	Conversions for geohashes
CGeoid	Looking up the height of the geoid above the ellipsoid
CGeoref	Conversions for the World Geographic Reference System (georef)
CGnomonic	Gnomonic projection
CGravityCircle	Gravity on a circle of latitude
CGravityModel	Model of the earth's gravity field
CIntersect	Geodesic intersections
CLambertConformalConic	Lambert conformal conic projection
CLocalCartesian	Local cartesian coordinates
CMagneticCircle	Geomagnetic field on a circle of latitude
CMagneticModel	Model of the earth's magnetic field
CMath	Mathematical functions needed by GeographicLib
CMGRS	Convert between UTM/UPS and MGRS
CNearestNeighbor	Nearest-neighbor calculations
CNormalGravity	The normal gravity of the earth
COSGB	Ordnance Survey grid system for Great Britain
CPolarStereographic	Polar stereographic projection
CPolygonAreaT	Polygon areas
CRhumb	Solve of the direct and inverse rhumb problems
CRhumbLine	Find a sequence of points on a single rhumb line
CSphericalEngine	The evaluation engine for SphericalHarmonic
Ccoeff	Package up coefficients for SphericalEngine
CSphericalHarmonic	Spherical harmonic series
CSphericalHarmonic1	Spherical harmonic series with a correction to the coefficients
CSphericalHarmonic2	Spherical harmonic series with two corrections to the coefficients
CTransverseMercator	Transverse Mercator projection
CTransverseMercatorExact	An exact implementation of the transverse Mercator projection
CTrigfun	Representing a function by a Fourier series
CTrigfunExt	A function defined by its derivative and its inverse
CUtility	Some utility routines for GeographicLib
CUTMUPS	Convert between geographic coordinates and UTM/UPS