This site has some information on the ColecoVision, mostly on ColecoVision games and ColecoVision development.
Also, lots of tutorials for getting started with STM8 development using free tools can be found here.
Recently, some tutorials for getting started with MCS-51 development using free tools were added.
There is the LLVM+SDCC toolchain, a comparion of C compilers targeting the STM8 amd a comparion on RTOS availability for the STM8.
There is some information on computer graphics as well.