This STM32F103C8T6 based board can be programmed with either ST Micro’s tools or using the Arduino IDE.
ARM® 32-bit Cortex®-M3 CPU Core running at 72Mhz
64KB Flash, 20KB RAM
Peripherals include timers, ADCs, SPIs, I2Cs, USARTS, CAN, USB.
For more info: http://www.stm32duino.com/
Here is how I loaded the bootloader: Loading a Bootloader on the STM32 Blue Pill