These tools are implemented in Python, using boto3 and can be found on Github: https://github.com/ccpgames/aws-tools
Running bots for load testing is one example of a task where automation helps a great deal. I have scripts to create a number of machines, upload a tarball, extracting its contents and running a command. Once the command finishes the machines can be terminated.
I'm sometimes juggling a fair number of machines, and while each running instance is fairly cheap, things can add up, especially if I leave machines running idle just because I forgot to stop (or terminate) them. The list-machines script shows me a quick overview of all machines on my account.
I'll be adding tools to this collection as the need arises - feedback and contributions are welcome!