BLE Nano is the smallest Bluetooth Low Energy System-on-Chip (SoC) development board. You could develop application using Nordic's SDK, mbed.org or our open source Arduino Library for nRF51822.
This Kit include a companion board, DAPLink board, which is used to load firmware into BLE Nano from a PC.
1. Arduino Library for nRF51822
2. Nordic nRF51822 BLE SDK
3. mbed's Bluetooth Low Energy API
We have prepared a video "Tutorial: RedBear BLE Nano Quick Start with Arduino".