The STM32 Nucleo Board, NUCLEO-F091RC will work in conjunction with the STM32 F0 series microcontroller to allow you to build your own prototypes for embedded applications. With its easy to use development platform it can offer a quick solution in evaluating and developing with any ARM® 32-bit Cortex®-M0 RISC core STM32 F0 flash microcontrollers in the LQFP64 package.
The Nucleo development board connects with the Arduino™ and will support most shields. Also the ST Morpho headers help increase the functionality of the Nucleo Open Development Platform (ODP).
The ARM^® mbed enabled board has an integrated ST-Link/V2 circuit debugger and programmer (SWIM/SWD) and this will interface with the on board STM32L053R8T6 with a suitable STM32 MCU in your application.

STM32™ ARM® 32-Bit Cortex®-M0 microcontroller with LQFP64 package
Two types of extension resources: Arduino Uno Revision 3 connectivity, and STMicroelectronics Morpho extension pin headers for full access to all STM32 I/Os
mbed™-enabled (mbed.org)
On-board ST-LINK/V2-1 debugger/programmer with SWD connector
Flexible board power supply: USB VBUS or external source (3.3V, 5V, 7V to 12V); Power management access point
Three LEDs: USB communication (LD1), user LED (LD2), power LED (LD3)
Two push buttons: USER and RESET
USB re-enumeration capability: three different interfaces supported on USB; Virtual Com port, Mass storage, Debug port
Supported by Integrated Development Environments (IDEs) including IAR™, Keil®, GCC-based IDEs

STM32F0 Series 32-Bit ARM® Cortex®-M0 Microcontrollers, STMicroelectronics

The STM32 F0 Series of the 32-bit Flash Microcontrollers (MCUs) is based on the ARM Cortex™-M0 core; a core specifically developed for embedded applications. STMicroelectronics’s STM32 ARM Cortex™ M processor benefits from the Cortex-M0 architectural enhancements including digital signal processing, real-time performance, low voltage and low power. ST’s ARM® STM32 F0 mainstream series delivers a 32-bit performance and is ideal for small projects or platform decisions with its easy to use functionality.