In this link, you will get 10 best frameworks and libraries for AI in c and c++.
AI is an enormous field, so just saying "useful in games" doesn't mean too much. This apparently isn't exactly what you're looking for, but you may be able to get some use out of Alchemy:
"Alchemy is a software bundle implementing a range of algorithms for analytical relational learning and probabilistic logic inference, based on the Markov logic representation. It allows you to easily develop a wide range of AI applications, including Collective classification Link prediction Entity resolution Social network modeling Information extraction"
REFER TO THE BELOW LINK: