World Anvil is described as 'Write articles to detail and keep track of everything in your world! Choose from over 25 templates designed to inspire you with prompts and deepen your worldbuilding! Embed your maps, and include images, music and sound effects, and even secrets and spoiler markers, for an' and is a Novel Authoring tool in the games category. There are more than 25 games similar to World Anvil for a variety of platforms, including Web-based, Windows, Mac, Linux and Android apps. The best World Anvil alternative is Scrivener. It's not free, so if you're looking for a free alternative, you could try Fantasia Archive or Lore Forge. Other World Anvil like games are kanka.io, LegendKeeper, Fortelling and Campfire Write.
A versatile, cross-platform worldbuilding app that can be used as a simple note-taking app, a private local wiki, a writing tool for a novel, or a TTRPG campaign manager.
A campaign planner and manager with loads of world building tools. The online campaign manager has system flexibility with features include:
The Goblin's Notebook is a single-pane view of your tabletop RPG campaign notes for pre-session planning, in-session note taking and post-session recapping.
WorldLoom is a application which allows user to create articles, maps, scenes and timelines to tell about their story. Afterwards user can extract their project as a wiki in website format.
The new version of Character Story Planner, planning and building a story cannot be easier with the help with this app. It helps the writer to plan the building of character, relation, group, race, creature, etc with the new template system which let the user fill the...
A document manager and site builder/generator for Word users. You can open Word documents in tabs, manage documents on a project basis, full-text search documents across multiple project folders, attach tags, notes, stars, and so on to the documents.
Totally unrelated, World Anvil is not an editor.
Notebook is a set of tools for writers, game designers, and roleplayers to create magnificent universes — and everything within them.
Notebook.ai has a way cleaner interface and seems a lot easier to use. You have to pay to get private pages on World Anvil, but that's a free feature on Notebook.ai and it seems to have a lot more features geared towards writing and worldbuilding instead of just playing RPG games.
ChronoGrapher is an extremely flexible worldbuilding tool for writers, worldbuilders and game masters. It boasts a freeform notetaking wiki, interactive maps, tile map editor, extensive time and history tracking features and much more.
Scabard is a rules neutral RPG campaign manager and planner. We have campaigns for D&D (various versions), Pathfinder, Traveller, Savage Worlds, Warhammer, and a host of others.
Neverkin is a free and open-source webapp aimed at different kind of writers and storytellers that have large stories or worlds to keep track of. It includes a wide range of features and it keeps evolving. For example, Neverkin provides:
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This is for writing a book, World Anvil is for creating a world (for a book, series, RPG, game, or any other reason). There's some feature overlap but not much.