Hi! This is Boris from Loveapplegames. I am involved in game development for a living, and we are making an open source toolset for writing dialogues and interactive fiction for projects involving serious games. It's based on a language we call Wool, which originated from the Yarn language.

I've made a Web-based tool for editing and prototyping interactive fiction games, which can instantly export your game to an URL. If you want to try your hand at interactive fiction but are not sure where to start, give it a try!

-> The Wool editor documentation

-> Simple example game "The Gnome" (graphics courtesy of various authors)