These are very cheap STM8S003F3P6 development boards, however, they demand a SWIM compatible programmer to utilise.

There is a `DE' mark on the board which may suggest that Danger Electronics is the manufacturer, however, DE says the device is an STM8S103 but it's actually an STM8S003.

The silkscreen also names these the STM8 Minikit 20 but the product page at Danger Electronics names them the STM8S.

    VDD SWIM GND NRST   USB
RST                     PWR
BTN
                    VIN GND

PD4         PWR LED1    PD3
PD5         PD4 LED2    PD2
PD6                     PD1
RST                     PC7
PA1                     PC6
PA2                     PC5
GND                     PC4
VCAP      VDD VDD       PC3
VDD       GND GND       PB4
PA3                     PB5

Install STM8Flash and SDCC.

hg clone http://hg.kewl.org/pub/blinky++
cd blinky++/STM8S_Minikit_20
make
make install

Product page