GtkRadiant is now available under GPL license, along with some Quake II tools which we never got a chance to put under GPL before. Head over to the qeradiant website for all the details.
I want to personally thank everyone who has been contributing to the project over the years, specially Randy Reddig ( ydnar ) and William Joseph ( spog ) for the many hours they’ve put into this. And thanks for sticking to my word that eventually we were going to be able to place radiant under a more “open” license.
The website update has some additional info:
A tarball of the initial release is available from our ftp server, and the development website now holds a subversion repository with the GPL code. We expect development on the editor to continue as usual, and hope that many new developers will join us :-)