The best free alternative to Wonderdraft is Inkarnate. If that doesn't suit you, our users have ranked nine alternatives to Wonderdraft and six of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Wonderdraft are Azgaar's Fantasy Map Generator, Epic World Builder, AutoREALM and Worldographer.
Inkarnate is an all-in-one fantasy mapmaking platform with a free version and a huge library of assets. With Inkarnate, one can create world and region maps, city and village maps, battlemaps and interiors, as well as scenery maps.
Azgaar's Fantasy Map Generator (FMG) is a free online tool which produces procedurally generated and highly customizable fantasy maps. You can just use auto-generated maps or create your own world from scratch.
EpicWorldBuilder.com gives you a unified space to build worlds, design maps, run campaigns, and play online with friends without juggling multiple apps. The world-building system works like a personal Wikipedia, with pages for characters, places, items, and lore that you can...
AutoREALM is a Free GNU mapping software (a "cartographer") that can design maps of castles, cities, dungeons and more. AutoREALM is generally used by Role-playing Game practicants who enjoy doing their own maps. But it could fits the needs of other people.
An integrated overland hex mapper for worlds or regions; settlement vector mapper for cities or villages; and square battle mapper for dungeons.
RPG Map Editor is a browser-based battle map maker for Dungeon Masters and TTRPG players. Create grid-based encounter maps with terrain, props, stamps, labels, and PNG export for Roll20, Foundry VTT, online play, or print.
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It has nicer brushes right out of the box, and makes nicer maps without additional setup (in my opinion).