< No need for everything to be online
I've been considering trying to put together a gemini server that serves as a Z-Machine interpreter. Since Gemini allows for sending one line of input at a time, it seems perfect for that, plus there are a lot of good Z-Machine interactive fictions out there (like Zork!)
It's not happening terribly soon because of other, more important projects, but maybe some time.
Related, if you're making a fantasy-style game, you might look at Inform.
A demo game I put together as a class project with some useful plugins
Oh, I wish, thank you for the input... however I need to end this gamebook first, and then on to further adventures! :)
That said, I think some people should band together to develop games together to make better use of our limited time