Start and stop your AWS EC2 Instances from your status bar with Cloud Control for EC2.
This app stores your AWS Access Key ID / Secret Access key in your MacOS Keychain safely, and uses it it query status of EC2 instances and allows you to start or stop them. Because it uses access keys, you can set least-privilege permissions to the keys so that they can only be used to list, stop, and start all or a subset of you EC2 instances.
The current supported regions are: us-east-1, us-west-1, us-west-2, eu-west-1, eu-central-1, ap-southeast-1, ap-northeast-1, ap-southeast-2, sa-east-1, and cn-north-1.