RedbearLab nRF51822 is an integrated "ARM + BLE4.0" development board.
They have integrated Nordic nRF51822 with Freescale MK20 into a single mbed and Arduino compatible board.
It is targeted for makers, engineers and students to develop low power Internet-Of-Things (IoT) projects/prototypes quickly and easily.

RedBearLab nRF51822 Pinout

Board Layout

A. Nordic nRF51822 Module
B. Freescale MK20DX128VFM5
C. System Reset Button
D. Indicate LEDs
E. SWD Interface For K20
F. SWD Interface For nRF51822
G. nRF51822 SPI Interface