I am searching for an open source AI engine implemented in C/C++, ActionScript or Java with no success. Do you know any open source implementation?
Update: Thanks for answers! I had no idea how vast the AI field is. I am working on a sample application. I want to add intelligent behavior over a physics engine. I need some sort ai engine designed for games.
"AI engine" can mean an awful lot of different things. What kind of "AI" are you looking for?
Here is a list of some machine learning software. Many of them are open source (the linked page shows the licenses).