These are very cheap STM8S103F3P6 development boards, however, they demand a SWIM compatible programmer to utilise.

+V  D3  D2  D1  C7  C6  C5  C4  C3  B4  B5

                                       3V3
USB    RST   TEST-LED-B5              SWIM
PWR    BUT   PWR--LED                  GND
                                      NRST

-V  D4  D5  D6  RST A1  A2  GND 5V  3V3 A3

Install STM8Flash and SDCC.

hg clone http://hg.kewl.org/pub/blinky++
cd blinky++/STM8S103F3P6
make
make install