A list of the 7 libraries in the architecture nrf52.

Arduino Low Power Power save primitives features for SAMD and nRF52 32bit boards
BSEC Software Library Bosch Sensortec Environmental Cluster (BSEC) Software library
Codec2 The Codec2 library is a proof-of-concept for running the Codec2 audio codec on an Arduino-compatible Adafruit Feather nRF52 Bluefruit LE board.
LoRa Node LoRa Node library for Arduino LoRa Node Shield.
Servo Allows Arduino/Genuino boards to control a variety of servo motors.
SPIMemory SPI Memory library for Arduino. (Formerly SPIFlash)
SX126x-Arduino Arduino library to use Semtech SX126x LoRa chips and modules to communicate