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Inform
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.
http://inform7.com
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Twine
Twine is an open-source tool for telling interactive, nonlinear stories. You don't need to write any code to create a simple story with Twine.
http://twinery.org
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inklewriter
inklewriter is a free tool designed to allow anyone to write and publish interactive stories. It is perfect for writers who want to try out interactivity, but also for teachers and students looking to mix computer skills and creative writing.
http://www.inklestudios.com/inklewriter/
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TADS
TADS is a free authoring system for writing your own Interactive Fiction. It offers a complete set of programming tools for creating high-quality IF.
http://www.tads.org
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Hugo
Hugo is a system for developing and playing sophisticated computer adventure games.
http://www.generalcoffee.com/hugo/gethugo.html
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StoryNexus
StoryNexus gives you free access to hundreds of interactive worlds, from science fiction to romance, from Gothic fantasy to historical adventure.
http://storynexus.com/s
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Wunderverse
Wunderverse was designed to give you the kind of freedom a Game Master or Dungeon Master might have when creating and building new adventures to share with your friends.
http://wunderverse.com
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Curveship
Curveship is an interactive fiction system that provides a world model while also modeling the narrative discourse, so that the narration and description of the simulated world can change.
http://curveship.com
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ChoiceScript
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.
https://www.choiceofgames.com/make-your-own-games/choicescript-intro/
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Guncho
Guncho is an online system for multiplayer interactive fiction based on Inform 7.
https://www.guncho.com
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Seltani
Seltani is an online, shared, text-based, open-source fan project based on the Myst series of games. In this environment, players can create and share explorable worlds.
http://seltani.net
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ADRIFT
ADRIFT Developer is a Windows application that allows you to create complex interactive fiction games quickly and easily.
http://www.adrift.co
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Quest
Quest lets you make text adventure games and gamebooks.
http://textadventures.co.uk/quest
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Raconteur
Raconteur makes writing interactive hypertext fiction with the Undum engine straightforward and perhaps even fun.
http://raconteur.readthedocs.io/en/latest/
