Writing tools for Interactive Media
Celtx
"An all-in-one system for writing, planning, and collaborating on video and game productions"
https://www.celtx.com/index.html
ChatMapper
"ChatMapper is an easy to use tool for writing and testing nonlinear dialogue and events for fields where complex problems are the normal, such as entertainment, e-learning, emergency response, diagnoses health care, sales and customer service, and strategic planning."