The most obvious way is to roll-your-own scripts, and use the AWS API tools.  Such scripts could be written in bash, perl or other language or your choice.  Next option is to use a configuration management and provisioning tool like puppet or better it’s successor Opscode Chef.  You might also look towards a tool like Scalr.  Lastly you can go with a managed solution such as Rightscale.
1. AWS API Tools : https://aws.amazon.com/developertools/351
2. OpsCode Chef : https://www.chef.io/
           
1. AWS API Tools : https://aws.amazon.com/developertools/351
2. OpsCode Chef : https://www.chef.io/
3. Scalr:  http://www.scalr.com/
4. RightScale:   http://www.rightscale.com/



It was a nice article on AWS automation tools. I found this information very useful. Thanks for sharing
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