Blue Pill
The Blue Pill board is a Arduino nano like board, named Blue Pill. Older versions of the Blue Pill board featured a ST STM32F103 as target MCU while the latest version of the board is shipped with a CKS CS32F103 (CS32F103CB) instead. The board does not come with an standard debug connector but with 4 pins which can be used to connect an J-Link to the MCU.