EC2 isn't free but it's pretty cheap, it starts from 0.10$/h. If you follow the tutorials on EC2 you'll see that it's pretty well explained how you see your run

EC2 isn't free but it's pretty cheap, it starts from 0.10$/h. If you follow the tutorials on EC2 you'll see that it's pretty well explained how you see your running instances and how to stop them. There is also elasticfox, a Firefox plugin to manage your instances (and other complex commercial management tools)