1. Grimoire: for DMs who left because WA is articles and their campaign is a system
Grimoire is the structural opposite of World Anvil. WA is articles you publish. Grimoire is structured data you query. It ships with a pre-built schema for 14 typed entities (NPCs, locations, factions, quests, items, and more), multi-projection knowledge graphs instead of organization-only diplomacy webs, a real-time collaborative wiki, and a player portal with three named visibility tiers so players see exactly what you have revealed.
It is also the only tool on this list with native MCP: one OAuth click connects your campaign to Claude, ChatGPT, or any MCP-compatible client, and your AI assistant reads your world live instead of forgetting it between chats. AI is optional, the product is complete without it, and Grimoire never charges for AI tokens.
The free tier answers the two loudest WA complaints directly: no ads anywhere, ever, for you or your players, and depth-shaped generosity (one campaign, unlimited entities, graphs, portal, and MCP included).
Honest weaknesses: Grimoire is early. Small community, no built-in SRDs, no Foundry VTT integration, no interactive map canvas, no novel-writing tools, no creator monetization. It does one job: running homebrew campaigns as a connected system.
Best for: homebrew DMs running active campaigns who want structure and, optionally, an AI that knows their canon. Read the full Grimoire vs World Anvil comparison.