The Doom 3 source-code -- based upon the id Tech 4 engine -- is now available as open-source software to the gaming community under the GNU GPL license.
Pushed onto GitHub
is the Doom 3 source-code. This comes after John Carmack had to work-around Carmack's Reverse
due to legal issues. The source drop is right in line with what we were expecting
More details to come soon on the open-source drop of Doom 3, which will hopefully spark a new wave of more impressive free software games.