The best Hammer++ alternatives
The rest of Best Game Level Editors, in this site's order: each with what it costs, where it runs and its record score.
GridCraft suits game developers working with tile maps who want browser editing, desktop access, or collaboration.
This editor suits players who want to build and immediately play skirmish maps within the Dune II remake.
GtkRadiant is intended for commercial developers and individual modders making levels for supported id Tech games.
LDtk suits game developers who need to design 2D platformer or top-down levels and define entities.
Sprite Fusion suits people making 2D game maps, retro projects, virtual tabletop maps, or educational apps.
NetRadiant suits game mappers and modders building 3D levels for Xonotic, Unvanquished, or other supported games.
It suits OpenTibia map makers who need terrain, item-search and map-export tools.
DarkRadiant suits people creating levels or fan missions for The Dark Mod and supported games.
Tiled suits game developers building 2D levels, especially tile maps, who need varied map projections and editing tools.
Tilemap Editor suits people making 2D maps on mobile devices or looking for a small editor to embed in JavaScript projects.
It suits players who want to build and exchange Mega Man stages, including collaborators working online.
It suits indie developers making 2D levels who need tile, decal, entity, and metadata layers.
QuArK suits people creating total conversions or editing resources for games built on Quake-like engines.
TrenchBroom is aimed at people creating maps for brush-based game engines.
It suits game developers who want browser-based tools for 2D maps, tilesets, pixel art, and engine-oriented exports.