uMap - uMap let you create maps with OpenStreetMap layers in a minute and embed them in your site.
Inkarnate - A free-form map editor for role-playing games, focusing on overland and continental maps.
FacilMap - Map platform for live, collaborative map creation based on OpenStreetMap.
Wonderdraft - is an intuitive yet powerful fantasy map creation tool for 64-bit Windows 10, Linux, and MacOSX.
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
Campaign Cartographer - Campaign Cartographer is the leading map making software for games (RPGs, miniatures and wargaming).