nRF Connect is a cross-platform tool that enables testing and development with Bluetooth® low energy (previously called Bluetooth Smart). It allows easy setup of connections with other devices and use these connections for reading and writing to the external nodes. It is supported on Windows, Ubuntu Linux and OSX, separate downloads for each platform.
nRF Connect is designed to be used in conjunction with the nRF51 DK, the nRF51 Dongle or the nRF52 DK running a specific connectivity application. nRF Connect will automatically detect which kit is connected and upload the needed FW if not programmed into the kit already.