Poseidon
Poseidon Software was a New Zealand-based company that produced software for the Sega SC-3000. The company published the games of developers such as Stephen Coupe and Michael Boyd.
Trident Technological Systems
Trident Technological Systems was a New South Wales based company that bought original, saleable programmes from independent programmers, and published them in Australia. They are known to have published several titles for the Sega SC-3000.