GtkRadiant

GtkRadiant 1.5

Free
GtkRadiant is the official level design toolchain for games.
 
1.5 (See all)

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. It supports a number of games powered by id Tech engines, supporting both commercial developers and individual modders.

Open source
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