Here is a list of all documented files with brief descriptions:

atsamr21-xpro
include
System.hpp	Microchip SAMR21 Xplained Pro Board specific API
typedef.h	Type definitions for ATSAMR21-Xplained Pro
feather-m0
include
System.hpp	Feather-M0 Board specific API
typedef.h	Type definitions for Adafruit Feather-M0
include
dev
AcCurrentSensor.hpp	Public driver declarations and configuration constants
Adafruit_ADS1X15.hpp
Adafruit_AMG88xx.hpp	Public driver declarations and configuration constants
Adafruit_GFX.hpp	Public driver declarations and configuration constants
Adafruit_NeoPixel.hpp	Public driver declarations and configuration constants
Adafruit_SSD1306.hpp
Adafruit_SSD1306_splash.h	Built-in SSD1306 startup bitmap data; not a callable driver API
Adafruit_VC0706.hpp	Public driver declarations and configuration constants
Adafruit_VL53L0X.hpp
Adafruit_VS1053.hpp	Public driver declarations and configuration constants
CM1106.hpp	Public driver declarations and configuration constants
Dogm128_6.hpp	Public driver declarations and configuration constants
EVAM8M.hpp	Public driver declarations and configuration constants
gfxfont.hpp	Glyph and font storage formats used by Adafruit_GFX
GPS.hpp	Public driver declarations and configuration constants
HTU20D.hpp	Public driver declarations and configuration constants
HTU2xD.hpp	Public driver declarations and configuration constants
HX711.hpp	Public driver declarations and configuration constants
KXM12864M_3.hpp	Public driver declarations and configuration constants
LiquidCrystal_I2C.hpp	Public driver declarations and configuration constants
M25P32.hpp	Public driver declarations and configuration constants
MaxBotix_HRXL_MaxSonar_WR.hpp	Public driver declarations and configuration constants
MCP391x.hpp	Public driver declarations and configuration constants
MMA8452Q.hpp	Public driver declarations and configuration constants
MT3339.hpp	Public driver declarations and configuration constants
ORG4400.hpp	Public driver declarations and configuration constants
PCF8574.hpp	Public driver declarations and configuration constants
PMS3003.hpp	Public driver declarations and configuration constants
PMS7003.hpp	Public driver declarations and configuration constants
RHT03.hpp	Public driver declarations and configuration constants
SHTSensor.hpp	Public driver declarations and configuration constants
SparkFun_BQ27441.hpp	Public driver declarations and configuration constants
SparkFun_CCS811.hpp	Public driver declarations and configuration constants
SparkFun_VEML6030.hpp	Public driver declarations and configuration constants
ST7920.hpp	Public driver declarations and configuration constants
T9602_I2C.hpp	Public driver declarations and configuration constants
TM1637Display.hpp	Public driver declarations and configuration constants
VC0706.hpp	Public driver declarations and configuration constants
VL53L5CX.hpp	Public driver declarations and configuration constants
nrf5x
nRF5xFlashPage.hpp	NRF5x flash page
nRF5xSPI.hpp	SPI implementation for nRF5x
stm32f4
STM32F4xxFlashSector.hpp	STM32F4xx Flash Memory (Sector)
AT86RF233Chip.hpp	Atmel AT86RF233 Radio Chip
BLE2902.hpp	Descriptor for Client Characteristic Configuration
BLE2904.hpp	Descriptor for Characteristic Presentation Format
BLEAddress.hpp	A BLE device address
BLEAdvertisedDevice.hpp	A representation of a BLE advertised device found by a scan
BLEAdvertising.hpp	Advertisement data set by the programmer to be published by the BLE server
BLEBeacon.hpp	Representation of a beacon
BLECharacteristic.hpp	A management structure for BLE descriptors
BLEClient.hpp	A model of a BLE client
BLECommon.hpp	BLE common
BLEDescriptor.hpp	A model of a BLE descriptor
BLEDevice.hpp	BLE functions
BLERemoteCharacteristic.hpp	A model of a remote BLE characteristic
BLERemoteDescriptor.hpp	A model of remote BLE descriptor
BLERemoteService.hpp	A model of a remote BLE service
BLEScan.hpp	The result of having performed a scan
BLESecurity.hpp
BLEServer.hpp	A data structure that manages the BLE servers owned by a BLE server
BLEService.hpp	A data mapping used to manage the set of BLE characteristics known to the server
BLEUUID.hpp	A model of a BLE UUID
BLEValue.hpp	A model of a BLE value
BootloaderSupportable.hpp	Bootloader Interface for systems with bootloader
CC1200Chip.hpp	TI CC1200 Sub-1GHz RF Transceiver
CoAP.hpp	Libcoap API wrapper for Nol.A SDK
CoAPResource.hpp	CoAP API wrapper of libcoap for CoX SDK
ConfigConsole.hpp	Configuration console class
cox.h	API and definitions
CXD5603GFChip.hpp	Sony CXD5603GF GPS/GNSS Chip
DSTWRanging.hpp	Double-sided Two-way Ranging
DW1000Chip.hpp	DecaWave DW1000 UWB Radio Chip
FLRCFrame.hpp
IEEE802_15_4Frame.hpp	IEEE 802.15.4 Frame
IEEE802_15_4Mac.hpp	IEEE 802.15.4 MAC API
IPv6.hpp	IPv6 Protocol
IPv6Interface.hpp	IPv6 Network Interface
IPv6LoRaWAN.hpp	IPv6 Network Interface - LoRaWAN
IPv6LoRaWAN_IP_UDP_Compressor.hpp	IPv6 and UDP header compressor for IPv6 over LoRaWAN
IPv6LoWPAN.hpp	IPv6 Network Interface - 6LoWPAN
IPv6MulticastRouting.hpp	IPv6 Multicast Routing Protocol
IPv6PPPoS.hpp	IPv6 Network Interface - PPPoS
IPv6UnicastRouting.hpp	IPv6 Network Interface
LBTRadio.hpp	Listen-Before-Talk for LoRa radio chips
LMac.hpp	LMAC: CSMA for LoRa Networks
LoRa2GHzFrame.hpp
LoRaMac.hpp	LoRaMac class
LoRaMacLBT.hpp	LoRaMac for Listen-Before-Talk
LPPMac.hpp	LPPMac class
MAX14676Chip.hpp	MAX14676 Battery Manager
McuARMCortexM.hpp	ARM Cortex-M
McuATSAMD21.hpp	Microchip SAM D21 MCU
McuATSAMR21.hpp	Microchip SAM R21 MCU
McuESP32.hpp	Espressif ESP32
McuGeneric.hpp	Generic MCU
McuMSP430x5.hpp	TI MSP430x5 MCU
McuNRF51.hpp	Nordic Semiconductor nRF51 MCU
McuNRF52.hpp	Nordic Semiconductor nRF52 MCU
McuSTM32F0xx.hpp	STM32F0xx MCU
McuSTM32F4xx.hpp	STM32F4xx MCU
McuSTM32L0xx.hpp	STM32L0xx MCU
McuSTM32L1xx.hpp	STM32L1xx MCU
McuSTM32WLxx.hpp	STM32L0xx MCU
ModbusMaster.hpp
nola-common.h	System and user common types and functions
nRF51Radio.h	Nordic Semiconductor nRF51 SoC Radio
PacketRadio.hpp
PacketRadioChip.hpp	PacketRadioChip class
PacketRadioSniffer.h	PacketRadioSniffer
PacketRadioTransmitter.h	PacketRadioTransmitter
Protothread.hpp	Protothread Porting for Nol.A-SDK
Queue.hpp	Queue
Radio.hpp
RadioPacket.hpp
RS485.hpp	RS485 class
RTCCalendar.hpp	RTCCalendar class
SdCard.hpp	SdCard class
SeggerRtt.hpp	SEGGER RTT (Real Time Transfer) Wrapper
SerialPort.hpp	SerialPort class
SLIPConverter.hpp	Serial Line Internet Protocol (SLIP) Converter
SoftwareSPI.hpp	Software Serial Programming Interface (SPI)
SPI.hpp	Serial Programming Interface (SPI)
Storage.hpp	Storage class
SX126xChip.hpp	Semtech SX126x Radio Chip
SX1272Chip.hpp	Semtech SX1272 Radio Chip
SX1276Chip.hpp	Semtech SX1276 Radio Chip
SX127xChip.hpp	Semtech SX1272/6 Radio Chip
SX1280Chip.hpp	Semtech SX1280 Radio Chip
SX1280ChipSPI.hpp	Semtech SX1280 radio chip that connected via SPI
SX1301Chip.hpp	Semtech SX1301 Radio Chip
Timer.hpp	Timer class
Trickle.hpp	Trickle timer
TSCHMac.hpp	TSCHMac class for IEEE 802.15.4e TSCH mode
TwoWire.hpp	TWI / I2C interface
UDP.hpp	User Datagram Protocol
nordic-nrf52-dk
include
System.hpp	NRF52-DK specific API
typedef.h	Type definitions for nRF52-DK
plm100s
include
System.hpp	PLM100S specific API
typedef.h	Type definitions for PLM100S
plm150
include
System.hpp	PLM150 specific API
typedef.h	Type definitions for PLM150
rak3172
include
System.hpp	RAK3172 specific API
typedef.h	Type definitions for RAK31720
st-nucleo-f429zi
include
System.hpp	ST Nucleo-F429ZI specific API
typedef.h	Type definitions for ST Nucleo-F429ZI
st-nucleo-l073rz
include
System.hpp	ST Nucleo-L073RZ specific API
typedef.h	Type definitions for ST Nucleo-L073RZ
st-nucleo-l152re
include
System.hpp	ST Nucleo-L152RE specific API
typedef.h	Type definitions for ST Nucleo-L152RE