io.github.TTimo.GtkRadiantGtkRadiantLevel editor for ID Tech based games including Quake seriesTimothee "TTimo" Bessethttps://icculus.org/gtkradiant/https://github.com/TTimo/GtkRadiant/issueshttps://icculus.org/gtkradiant/documentation.htmlDevelopmentX-LevelEditorX-GameLevelEditor
GtkRadiant is the official level design toolchain for games powered by id Tech engines from id Software, and is maintained by a community of volunteers. GtkRadiant is powered by the GTK+ Project and released under a GPL license.