Extensible First Person Shooter in C++?

Question

I've recently become interested in the study of AI programming and how it relates to games. I'm interested to see what it's like to create AI for a first-person shooter-type game with C++.

So, that leads me to my question. I would rather not spend my time writing a complete FPS just for the purpose of practicing AI design, so does anyone know of any existing projects/engines with completely functional games that I could simply extend (in C++) with AI somehow?

Thanks.

Answer 1

Cube 2: Sauerbraten is a free multiplayer as well as a singleplayer first-person shooter game which is the successor of the Cube FPS. There are lots of bots for the FPS CounterStrike.

Alien Swarm additionally shipped with the source code as a part of its SDK, thus you may begin with the AIs and modify them the way you want.