JavaScript mapmaker Projects

Fantasy-Map-Generator

597 4,258 8.6 JavaScript

Web application generating interactive and highly customizable maps

Project mention: CC0-licensed fantasy map brushes based on historical cartography | news.ycombinator.com | 2023-12-21

Adding to the other answers, there are also -besides Photoshop, Gimp, etc- specialized tools to draw fantasy maps. The site mentions Wonderdraft [0], but there are a bunch of others though not all of them support using external brushes.
Some other tools in this space may be Watabou's tools [1], Azgaar's tools [2], Inkarnate [3], Mapforge [4], or quite a few more which you can find links to in this list [5]. Again: you could use these brushes with some of these; not all support external brushes.
[0] https://www.wonderdraft.net/
[1] https://watabou.github.io/
[2] https://azgaar.github.io/Fantasy-Map-Generator/
[3] https://inkarnate.com/
[4] https://www.mapforge-software.com/
[5] https://www.mapforge-software.com/links-to-map-making-apps/

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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).