Hi, I'm trying to use AI in practice. Do you know where can I find such fully functional games with source code. Of course well-known methods (path finding, A*, GA, etc) are better. Thanks in advance.

Sourceforge.net is probably a good place to look.

A search for "pathfinding".
A search for "ga".

I've got a little A-Star pathfinding app which can be downloaded here A Star pathfinding app.
It shows a 2D map with 1000s of nodes, you can select 2 nodes and watch as it finds the best path between them.
All the source code is included (C++)