Instead of NetRadiant
NetRadiant alternatives
NetRadiant is a free, open-source editor for building 3D game levels with brushes. Its clearest fit is mapping for Xonotic and Unvanquished, which have first-class compatibility; it also supports about 30 other games, though support varies. Builds include daemonmap for Unvanquished navmesh generation and Smokin’ Guns q3map2 patches. Released Xonotic files work without an extra mapping support package, and the editor runs on Linux, macOS, and Windows.
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GridCraft
Free plan APILinuxMac+2Collaborative tile maps across multiple game engines — GridCraft edits 2D tile maps in a browser or desktop app, with live collaboration and exporters rather than NetRadiant’s brush-based 3D mapping.
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Remere's Map Editor
Free plan LinuxMacWindowsOpenTibia map editing — Remere’s Map Editor targets OpenTibia, with zone import and export, minimap export, and support for client 11-or-higher assets.
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Sprite Fusion
Free plan LinuxMacWeb+12D tile maps with engine and tabletop exports — Sprite Fusion is a browser-based 2D tilemap editor with autotiling, collision layers, and exports for game engines and virtual tabletops.
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DarkRadiant
Free plan LinuxMacWindowsDoom 3 and The Dark Mod levels — DarkRadiant focuses on Doom 3 and The Dark Mod, adding specialized The Dark Mod editors and tools for materials, models, and UVs.
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Dune II - The Maker Map Editor
Free plan Open source LinuxMacWindowsSkirmish maps for Dune II – The Maker — Dune II – The Maker includes an in-game editor for playable skirmish maps, with terrain, spice, start-position, and symmetry tools.
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GtkRadiant
Free plan Open source LinuxMacWindowsMapping for id Tech-powered games — GtkRadiant is a related open-source id Tech editor and toolchain with map compilers and Q3Map2, but its game support depends on active developer maintenance.
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LDtk
Free plan Open source APILinuxMac+12D levels with custom entities and auto-layering — LDtk is a 2D level editor with automatic tile skinning, custom entities, and PNG or JSON exports instead of brush-based 3D mapping.
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Avidemux
Free plan Open source LinuxMacWeb+1 - 9
2D Tiler
Free plan Web - 10
J.A.C.K.
Free plan LinuxMacWindows - 11
Doom Builder 64 Enhanced
Free plan Windows - 12
Hammer++
Free plan LinuxWindows - 13
Mapster32
Free plan LinuxMacWindows - 14
Mega Man Maker
Free plan LinuxMacWindows - 15
Ogmo Editor
Free plan LinuxMacWindows - 16
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Lönn
Free plan LinuxMacWindows - 18
QuArK
Free plan LinuxWindows - 19
Tiled
Free plan LinuxMacWindows - 20
Doom Builder X
Free plan Windows - 21
TrenchBroom
Free plan LinuxMacWindows - 22
PixLab Tilemap Editor
Free plan Web - 23
SonLVL
Free plan LinuxMacWindows - 24
Tilemap Editor
Free plan AndroidiPhoneWeb
A different tool may suit better if you need 2D tilemaps, an editor tied to another game, or a different asset workflow. Linux use requires a working GTK2 and OpenGL environment, while the project described macOS support as new and potentially rough, including possible multi-screen problems. Before switching, weigh the target game and map type, supported export formats, collaboration or specialized editing tools, and any platform requirements. The alternatives range from tilemap editors with engine exports to other brush-based editors focused on particular games.