Game Maker 
ahahaha...ha....haha...ha.ha.ha.....ha.....haha..
.ha... haaa...
seriosuly, tried that long time ago, that game making engine, is really easy, simple, and good. BUT, not good for fps and multiplayer.
I made a game with Gamemaker, like, five times, but only one was a real success... ever tried Hard Met games? Made with Game Maker in
damagedgames (I know that person! But not in real life.)Also, what program is best for modelling?
Also, note, that I am making a first person shooting game. It's gonna be either multiplayer, or singleplayer and multiplayer. Which tool is best for making a fps game? And which modelling program is the most simplest?