A list of the 6 libraries in the architecture nrf5.

arduino-NVM Direct flash memory access, round robin virtual pages and EEPROM like memory. (Flash, VirtualPage, NVRAM)
iBit_Arduino A control library for iBit Board.
MicroGamer A library for content creation on the Micro:Gamer gaming platform
MicrobitV2-HHS Library for Microbit Version 2 with Radio (NRF52) and PWM support (Tone and Servo).
MMA8653 Allows reading the MMA8653 accelerometer.
NRF51_Radio_library Microbit Radio library for NRF51, based on runtine inplementation from Landcaster University