AWS Systems Manager (formerly Amazon EC2 Systems Manager) is a unified interface that allows you to easily centralize operational data and automate tasks across your AWS resources
AWS SSM has an Agent that can be installed on your EC2 instances and allows your to do things like run commands, monitor and upload logs to Cloudwatch. Do take a look at http://docs.aws.amazon.com/systems-manager/latest/userguide/what-is-systems-manager.html for more info.