GtkRadiant is an open-source, cross-platform level editor for id Tech based games. It comes with some map compilers and data authoring tools.
Downloads
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Ready-to-use GtkRadiant packages are available on the [Downloads page](http://icculus.org/gtkradiant/downloads.html) on GtkRadiant's website. Some [installation instruction](https://icculus.org/gtkradiant/installation.html) may be useful.
You can find more complete instructions to build on Windows [here](https://icculus.org/gtkradiant/documentation/windows_compile_guide/) and to build on Mac OS [here](apple/README.md).
Building locally on Arch is the only setup that's likely to work as it's my daily driver. Ubuntu, Fedora etc. you are on your own. See the Flatpak SDK section below.
You can also checkout the GtkRadiant tree locally and [modify the manifest to point to it](https://gist.github.com/TTimo/fd683b368048dc8802e9aaf353ef68ec).
The [#radiant channel at QuakeNet](https://webchat.quakenet.org/?channels=radiant) is the official GtkRadiant IRC channel. Come and chat about level design, development or bugs, you're welcome. Bugs can be submitted on the [GitHub issue tracker](https://github.com/TTimo/GtkRadiant/issues).
Legal
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GtkRadiant source code is copyrighted by [id Software, Inc](http://idsoftware.com/) and various contributors and protected by the [General Public License v2](GPL).