http://nerogame.org/Its not a great game, but still pretty cool.
Basically, what its about is you make your team of army and you train them and them make them fight with other teams. The robots actually learn when you train them, like for example you create a team and drop them in a field, all they will do is run around and respawn after a few seconds, then you can insert a static enemy and give reward to the robots that get close to the enemy, after a while all your robots will start to spawn and go for the enemy right away. That is because when a robot gets close to the enemy it receives a score, and when the robots respawn the robots with the best score will be kept and the one with the worst score will be repaced by an offspring made from 2 robots with good score, making them learn.
Even though its a good game, the community looks dead =(
