GtkRadiant vs Sprite Fusion

GtkRadiant is a free, open-source level editor and toolchain for games powered by id Tech engines. It includes map compilers, data authoring tools, and Q3Map2, with tools for 3D levels, terrain, and entity placement. The GtkRadiant 1.6 page lists support for games including Quake III Arena, QuakeLive, Urban Terror, Wolfenstein: Enemy Territory, Quake2, Quake2: Remastered, Quetoo, Return to Castle Wolfenstein, Star Trek Voyager: Elite Force, and Jedi Academy. Support for a game can depend on an active developer to test and address issues; some titles may require an older version or third-party fork. GtkRadiant reads and writes assets in a game's directory, and the project recommends installing the game first. It runs on Linux, macOS, and Windows. Linux distribution is through Flathub as a Flatpak; the Mac version requires XQuartz, MacPorts, and other dependencies. Volunteers maintain the GPL-licensed project, which is provided as-is without warranty or support. Listed help options include forums, IRC, tutorial sites, and a GitHub issue tracker.

Sprite Fusion is a tilemap editor for designing 2D game maps, available in a browser and as a desktop app. You can import tilesets by dragging and dropping, loading an image, or pasting one from the clipboard, then draw with pencil, fill, selection, and attributes tools. Autotile layers use neighboring cells to resolve tiles, with variants, weights, and reusable rule presets. Collision layers can be exported for supported targets. Game engine exports include Unity, Godot 3 and 4, Defold, Bevy, Love2D, GDevelop, Phaser, Cocos, and GB Studio; other formats include TMX, Sprite Fusion JSON, PNG, and UVTT. UVTT exports can represent collider layers as walls for virtual tabletop software such as Foundry VTT. The Web Edition costs nothing and limits map exports to 4.5MB. The Desktop Edition costs $14.99, paid once, works offline, and exports maps of any size. It has Windows and macOS builds, plus an experimental 64-bit Linux build.