Twine, a tool for telling interactive, nonlinear stories...and playing them in-browser.

A choose-your-own-adventure (CYOA) engine.

AdventureBuildr: A storytelling operating system that helps writers build choose-your-own-adventure stories. Readers can choose their own path in the stories that you write.

Choose Your Own Adventure game "engine"

A d20-enhanced Choose Your Own Adventure (CYOA) engine prototype you play in your browser.

An open-soure tool to help you create your own text-based story games