This small board has a teletext decoder and display chip, so can be used as a cheap colour terminal for those happy with the limitations of teletext:
Teletext Experimenter’s BoardQuote:
Decode teletext from a composite-video carrier
Display it on an RGB monitor
Allow you to read a decoded page back to your host device
Allow you to substitute your own page data, making a “teletext quality” graphics card
Be controlled entirely via I2C!
The short header posts links (presently) to three followups
IntroductionThe CircuitConnecting RGB DisplaysLooks like there will be kits for sale.