Quest is described as 'lets you create sophisticated text-based games, without having to program. Make text adventures, role-playing games, training materials, simulations, or interactive fiction'. There are more than 10 games similar to Quest for a variety of platforms, including Windows, Linux, Self-Hosted solutions, Mac and Online / Web-based. The best alternative is Twine, which is both free and Open Source. Other Quest like games are Chronicler (Free, Open Source), ChoiceScript (Free, Open Source), Inform (Free) and Ink by Inkle (Free, Open Source).
Chronicler is an open source desktop application which allows users to create CYOA/MCG (choose your own adventure/multiple choice games) interactive fiction using a GUI not dissimilar to Twine (i.e. in the style of a flow chart).
ChoiceScript is a simple programming language for writing multiple-choice games (MCGs) like Choice of the Dragon. Writing games with ChoiceScript is easy and fun, even for authors with no programming experience.
Inform is a design system for interactive fiction based on natural language. It is a radical reinvention of the way interactive fiction is designed, guided by contemporary work in semantics and by the practical experience of some of the world's best-known writers of IF.