Sceptre
Sceptre is a 3rd party open-source tool by Cloudreach to drive AWS CloudFormation. It provides a layer of abstraction over CloudFormation to make created and maintaining cloud infrastructure easier.
GitHub Repo: https://github.com/Sceptre/sceptre
Installation
Sceptre can be installed with Python:
Stacks
Each Stack in Sceptre is organized by one or more Stack Groups.