half life is born from quake ..i saw a lot of tools or viewer or map maker that handle quake [ 1 or 2] and hl maps..
here is one
http://www.gildor.org/en/projects/quake2i would like to have a stronger system for bots and a lot of effects for weapons , plus a stable engine..
i found an other doom3 source code based on bfg , it has few bugs in the graphic rendering..
so today i had a new idea ;']
i want to reuse monsters and weapons of quake4 , roe and prey in the doom3 story
that should be quite easy for me to edit the entities of map like i did with hl maps..
i want to use the marines to replace models of the uac before the disaster and when the doom is started i think of using the stroggs instead of the zombies .. that will make the game "more firepowered" ;']
same with humans of prey ... prey also has some monsters that can fit well the hell ...quake 4 too..
these days i will replay these games and search for spots where to do changes.. i am already thinking that can make a great game ;']
beside monsters , new weapons...that are cool either ...
i think that should be possible if someone is able to create the dll ...
this forum seems to be the best place for finding ..