With this mod finally you can have a COOPERATIVE SPLITSCREEN experience on Doom 3 (and Resurrection of Evil), you just need a keyboard-mouse (Player 1) and and Xbox 360 Controller (for Player 2). DISCLAIMER: I'M NOT DEVELOPING THIS MOD, ADOLIF FROM SOURCEFORGE.NET IS.
Barely working split screen for Doom 3. In proof-of-a-concept state. It was a dream for a lot of people back in the day, but it's not it yet: only one controller is supported, Doom 3 has to be installed in default folder, there is myriad of bugs and problems - there is huge chance that it won't launch at all. Even if it will - you will not enjoy it.
Split screen coop in Doom 3 is possible, but it's disappointing to see it in this state. That's why I put 5 here: this mod hurts.
Too bad developer disappeared halfway.