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STM8 on the STMicroelectronics website: http://www.st.com/content/st_com/en/p...
ATmega328 on the Atmel website (Microchip): http://www.atmel.com/devices/atmega32...

Mentioned products:
1) Debug board on STM8S103F3P6: https://goo.gl/PVP3IH
2) Arduino Nano debug board on ATmega328p: https://goo.gl/K24VDs
3) STLINK debugger for STM32 and STM8 (like mine): https://goo.gl/nR7uKU
4) STLINK debugger for STM32 and STM8 (in the case): https://goo.gl/YEdKHK

Software Links:
1) IAR: https://www.iar.com/iarembeddedwork...
2) Raisonance RIDE: http://www.raisonance.com/stm8s.html
3) ST Visual develop IDE: http://goo.gl/mtCpku
4) Cosmic: http://goo.gl/RV4hAB
5) STM8CC: http://fun4diy.com/stm8cc.htm
6) SDCC: http://sdcc.sourceforge.net