Alternatives to NetRadiant
NetRadiant is a free, open-source editor for constructing 3D game levels with brushes. Its strongest match is mapping for Xonotic and Unvanquished, with first-class compatibility for both and varying support for about 30 other games. The builds include daemonmap for Unvanquished navmesh generation and Smokin’ Guns q3map2 patches; released Xonotic files work without an additional mapping support package. It runs on Linux, macOS, and Windows, though Linux requires a working…
Dune II – The Maker Map Editor is an in-game editor for creating and changing skirmish maps in the open-source Dune II remake.
GtkRadiant is a free, open-source level editor and toolchain for games powered by id Tech engines.
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LDtk
LDtk is a free, open-source 2D level editor for game developers, available for Linux, macOS, and Windows.
Free planOpen sourceAPILinuxmacOSWindows7.2Free plan - 5

GridCraft
GridCraft is a tile map editor for game developers, available in a browser and as a desktop app.
Free planWebAPILinuxmacOS7.0From $3.99 a month - 6

Sprite Fusion
Sprite Fusion is a browser-based tilemap editor for designing 2D game maps, with a free web edition and a paid desktop edition.
Free planWebLinuxmacOSWindows6.9$14.99 one-time - 7
Hammer++
Hammer++ is a free Windows modification of Valve’s Hammer editor for building maps in the Source engine.
Free planLinuxWindows6.6Free plan - 8
Remere's Map Editor
Remere's Map Editor is a free map editor for OpenTibia, an open-source implementation of the MMORPG Tibia.
Free planLinuxmacOSWindows6.5Free plan - 9
DarkRadiant
DarkRadiant is a free, open-source level editor for Doom 3 and The Dark Mod.
Free planLinuxmacOSWindows6.2Free plan - 10
Tilemap Editor
Tilemap Editor is a free, open-source editor for creating 2D tile maps on Android, iOS, and the web.
AndroidiOSWeb6.2 - 11
Tiled
Tiled is a free 2D level editor for developing game content, especially tile maps.
Free planLinuxmacOSWindows6.1Free plan - 12
TrenchBroom
TrenchBroom is a free level editor for brush-based game engines such as Quake, Quake 2, and Hexen 2.
Free planLinuxmacOSWindows6.1Free plan - 13

2D Tiler
2D Tiler is a browser-based editor for game developers working on 2D levels, tilesets, pixel assets, palettes, and exports.
Free planWeb6.0Free plan - 14
Mega Man Maker
Mega Man Maker is a free fan game for creating, sharing, and playing user-made Mega Man levels.
Free planLinuxmacOSWindows6.0Free plan - 15
Ogmo Editor
OGMO Editor is a free, open-source level editor for indie game developers, available on Linux, macOS, and Windows.
Free planLinuxmacOSWindows6.0Free plan - 16
QuArK
QuArK is a free editor for maps and, to a limited extent, models used by games built on or near the Quake engine family.
Free planLinuxWindows6.0Free plan - 17
J.A.C.K.
J.A.C.K. is a level editor for games that use Quake-style BSP architecture.
LinuxmacOSWindows5.9$14.99 one-time - 18
Mapster32
Mapster32 is a tool for creating Duke Nukem 3D maps in .MAP files.
Free planLinuxmacOSWindows5.9Free plan - 19
Phaser
Phaser is an open-source game framework from Phaser, founded in 2013 and headquartered in San Francisco, California.
AndroidiOSWeb5.9 - 20
PixLab Tilemap Editor
PixLab Tilemap Editor is a free browser-based tool for creating and editing tile-based maps for 2D games.
Free planWeb5.9Free plan - 21
SonLVL
SonLVL is a level-project editor in the public Sonic Retro repository, a collection of tools and disassemblies made by its members.
LinuxmacOSWindows5.9 - 22
Ultimate Doom Builder
Ultimate Doom Builder is a free map editor for games based on Doom, Heretic, Hexen, and Strife.
Free planLinuxWindows5.9Free plan - 23
YATME
YATME is a browser-based OpenTibia map editor for Tibia 15.00+ client data.
Free planWebSelf-hosted5.9Free plan - 24
Doom Builder 64 Enhanced
Doom Builder 64 Enhanced is a free Windows map editor forked from Doom Builder 64, with the stated aim of updating its source code and adding tools for mappers.
Free planWindows5.7Free plan - 255.7
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Tomb Editor
Windows5.4 - 27
Doom Builder X
Windows5.2
