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Doom Builder X

Free plan Windows

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What Doom Builder X is

Doom Builder X is a free 32-bit Windows editor for creating Doom 2 maps. It is a fork of CodeImp’s Doom Builder 2, maintained for bug fixes, responsiveness, and a faster workflow. The editor provides 2D modes for drawing and changing geometry, a 3D visual mode, texture browsing, entity placement, and map testing from a player start at the mouse cursor. It includes an Eternity Engine UDMF configuration, supports UDMF map properties, and can use Eternity .pke files as resources. Plugin work includes Lua plus improved support for Visplane Explorer, Tag Range, Stair Builder, Sound Propagation, and Automap. Some GZDoom Builder plugin compatibility is unstable, with certain GZDoom features simulated for plugin operation. Doom Builder X supports Windows XP or newer and requires .NET 3.5, DirectX 9.0c Runtime, and SlimDX. It is GPL-3.0 licensed, while some components may use separate licenses. GitHub Releases lists 2021.1 as latest.

Who it suits

It suits Doom 2 level creators who prefer Doom Builder 2’s responsive workflow and need 2D/3D editing with Eternity or UDMF support.

What it does well

  • Free Doom 2 map editor
  • Includes 2D and 3D editing modes
  • Supports UDMF properties and Eternity resources
  • Provides texture browsing and map testing
  • Offers multiple editing plugins

What to know first

  • No direct Linux or Mac support
  • Some GZDoom plugin compatibility is unstable
  • Requires legacy .NET, DirectX, and SlimDX components

Verdict

Doom Builder X provides a focused Windows toolkit for Doom 2 mapping, including geometry, textures, 3D viewing, and testing. Users on other operating systems or relying on unstable GZDoom plugin compatibility may face limits.

Facts from Doom Builder X's own pages

Architecture
The README says Doom Builder X is 32-bit and supports Windows XP or newer. · github.com, 8 Oct 2026
Downloads
The repository README directs users to GitHub Releases for downloads, and the releases page lists Doom Builder X 2021.1 as the latest release. · github.com, 8 Oct 2026
Editing features
Release notes describe 2D and 3D editing modes, geometry drawing, texture browsing, and map testing from a player start at the mouse cursor. · github.com, 8 Oct 2026
Features
It includes 2D editing modes, a 3D visual mode, texture browsing, and tools for drawing and editing map geometry. · github.com, 8 Oct 2026
Formats and configs
The release notes describe a basic Eternity UDMF configuration and support for Eternity .pke files as resources. · github.com, 8 Oct 2026
Intended users
The project says it is for people who prefer Doom Builder 2’s responsiveness and faster workflow. · github.com, 8 Oct 2026
License
The project is licensed under GPL-3.0, while individual components such as node builders and ACS compilers may have their own licenses. · github.com, 8 Oct 2026
Limitations
The project says it does not directly support Linux or Mac and notes that running it through WINE may work on some systems. · github.com, 8 Oct 2026
Map formats
The project includes an Eternity Engine UDMF configuration and describes support for UDMF map properties. · github.com, 8 Oct 2026
Platforms
The project supports 32-bit Windows XP or newer and says it does not directly support Linux or Mac. · github.com, 8 Oct 2026
Plugin compatibility
The project says some GZDoom Builder plugin compatibility is unstable and that some GZDoom features are simulated to make plugins run. · github.com, 8 Oct 2026
Plugins
The 2019.1 release added a Lua plugin and improved support for Visplane Explorer, Tag Range, Stair Builder, Sound Propagation, and Automap plugins. · github.com, 8 Oct 2026
Product
Doom Builder X is a Doom 2 map editor and a fork of CodeImp's Doom Builder 2. · github.com, 8 Oct 2026
Purpose
Doom Builder X is a Doom 2 map editor and a fork of Doom Builder 2 focused on maintenance, bug fixes, and responsiveness. · github.com, 8 Oct 2026
Requirements
The listed prerequisites are .NET 3.5, the DirectX 9.0c Runtime, and SlimDX. · github.com, 8 Oct 2026
Security
The 2021.1 release says it updated SharpCompress to version 0.29 to fix a security advisory. · github.com, 8 Oct 2026
Support
The release notes ask users who encounter crashes to send the generated BuilderX-lastcrash.cfg file to the maker. · github.com, 8 Oct 2026

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