Undum is described as 'Remember those Choose Your Own Adventure, or Fighting Fantasy books? Where you got to choose what your character does next? Well if you think of that in a web-page you have hypertext interactive fiction, or HIF' and is a game development tool in the development category. There are more than 25 alternatives to Undum for a variety of platforms, including Windows, Web-based, Linux, Self-Hosted and Mac apps. The best Undum alternative is Dream Novel, which is free. Other great apps like Undum are Twine, Inky by Inkle, Ink by Inkle and QuestJS.
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.
Squiffy is a tool for creating multiple choice interactive fiction. It's written entirely in JavaScript - the compiler uses Node.js and the games it generates run in a web browser so it can run on any system with a modern browser.
Raconteur is a library of Undum tools that can get someone writing their story quickly. It tries to push Undum in the direction of Inform 7 and Twine, a system that puts the prose front and center.
Build text adventure games, role-playing games, training materials, simulations, and interactive fiction without having to program.
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...
Squeaker is a non-linear multi-language dialogue tree editor. Squeaker makes it easy to focus on composing and editing a game's script while keeping it all organized.
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.
Cross-platform tool for creating visual novels and interactive stories.
JAWA is an online tool which makes it possible to create, free, easily and quickly, point'n'click type investigation / adventure games, playable directly in the browser or in the form of mobile apps (smartphones & tablets).
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Undum is for writing. Story Nexus is for reading