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

EEPROM	Access I2C EEPROMs
Elum	Elum class to allow access to single Elums
FullDuplexSerial	This driver, once started, implements a serial port in one cog
GPSParser	Receives and parses NMEA0183 GPS streams into C strings
I2C	A basic I2C driver
I2CBase	Low level I2C driver
L3GD20	Provides an interface the L3GD20 gyroscope
LSM303DLHC	Provides an interface to the LSM303DLHC accelerometer and magnetometer
MAX17048	Interface to the MAX17048 Fuel Chip
Max8819	Max8819.h - Max8819 class to allow access to single pins
MCP3208	MCP3208 8 channel ADC Class
MS5611	MS5611 Barometer interface
MTK3339	Summary of supported sentences (note: order changed): GLL - Lat, long, time, status RMC - Lat, long, time, status, speed, true heading, date, magnetic variation GGA - Lat, long, time, status (enhanced), #sats, horizontal precision, altitude, geoidal seperation, differentialGPS age, differentialGPS referenceID VTG - true heading, magnetic heading, speed knots, speed km/hr GSA - Satelite IDs GSV - Satelite SNR in dB data
Numbers	Convert between numbers and the various string representations
PCF8523	Interface to the PCF8523 Real Time Clock (RTC)
Pin	Pin class to allow access to single pins
PulseWidthReader	Record high and low times simultaniously on any number of pins
PWM2	Run a high speed pulse width modulation (PWM) class that can output up to two channels of duty cycled PWM at a single frequency
PWM32	Run up to 32 channels of low speed PWM (up to ~10kHz@80MHz clock)
QuadratureEncoder	This object stores encoder ticks in a signed 4 byte int sized variable
Scheduler	A pollable timer to help schedule events
SD	FAT16/32 SD card interface
SDSafeSPI	SPI interface routines for SD & SDHC & MMC cards
Serial	A high speed and high accuracy serial driver
Stopwatch	Utility class for timing event duration
vnh2sp30	Operate a VNH2SP30 brushed DC motor driver