Clearly profiling itself as the Lamborghini or Ferrari of the STM32 development board world, MikroElektronika’s current (8th) revision of their Fusion development board was released last year… ...

The modular STM32 dev board utilises M.2 connectors for external communication via SPI, CAN and UART protocols. The IZIRUNF0 is based on ARM Cortex-M0 and is designed for low-power applications ...

It also follows the pinout of the original Maple Mini, and the team also has a version that’s a slight improvement of the original Maple. The big deal is, of course, the price of the board.