I’m surprised that someone hasn’t adapted text-only Quest Soft Player to Glk. It would be nice to have it as another back-end engine for Gargoyle and Thunderword.
Anyway, throwing the topic out there if any C programmers are itching for a project.
Digging around on GitHub, it looks like FastQSP may be the newest set of C code? github.com/graylor/FastQSP