Chisoft

Chisoft were a publishing company from New Zealand, run by Colin Maxwell (also of Maxtronics fame) who produced two games for the Sinclair QL computer which would use QTalk if it was connected:

Alien Hijack - a 3D adventure game where aliens have abducted the crew of your space ship
Puzzle Mania - a platform game where you need to collect various pieces of a puzzle and return them to the start