Twine is an open-source tool for telling interactive, nonlinear stories.
- - Twine is the most popular Web-based, Windows, Mac & Linux alternative to Undum.
- - Twine is the most popular Open Source & free alternative to Undum.
ink is a scripting language built around the idea of marking up pure-text with flow in order to produce interactive scripts.
Ink by Inkle Features
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).
Yarn Spinner is a tool for creating interactive dialogue for games. Write your conversations in Yarn, a simple programming language that's designed to be easy for writers to learn, while also powerful enough to handle whatever you need.
- - Dedalus is the most popular Self-Hosted alternative to Undum.
Multiple links within the Readme are 404'd, including the example game's page and the starter pack download. Also, the GitHub hasn't been updated since 2019.
Inform is a free app for creating works of interactive fiction, available for MacOS, Windows, Linux and Android. Inside it is a powerful programming language based on English language text. This redesigned website is part of the preparations for open-sourcing the software.
StoryNexus: The choice is yours. StoryNexus gives you free access to hundreds of interactive worlds, from science fiction to romance, from gothic fantasy to historical adventure.
Adliberum Engine is a multiplayer compatible role-playing text adventure engine. Complete with real-time world-building commands; craft text powered games and scenarios alone or with others. Complete with world editing commands; create worlds, games and puzzles that you can...
Ficdown is a set of standards using the Markdown formatting syntax that can be used to create choice-based interactive fiction. Formatting of text is done using standard Markdown, with a few Markdown elements taking on additional story-defining properties (for example, level-two...
Inquisitor is an engine for browser and multiplatform Interactive Fiction works. It bares similarities to Twine while facilitating creation of worlds with locations and items.
Narrat is a narrative game engine for text-based games. Game dialogue info is written in files with a similar syntax to Ren'Py (.rpy files). Those files get loaded by the game engine which plays through them.