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.

Kinexus is a game editor for creating, styling, and exporting choice-based narrative games, interactive fiction, and visual novels.

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

Choose Your Own Adventure game "engine"

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

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