FPS Creator actually comes in a free and low-priced version ($50); this isn't a tool for creating a commercial quality FPS, and open source tools do exist for doing that, but FPS Creator is one of many low-priced tools that offer a very gentle way to experiment with creating your own game even if you have no programming skills.
Few things are as enjoyable and rewarding as creating a game with and for friends. If you make one please share it with us
Direct link to FPS Creator: http://www.thegamecreator...=view_product&id=2001
Link to "Make Use Of" Article: http://www.makeuseof.com/...e-fps-creator/#more-43171