Rain
Rain is a development workflow tool for working with AWS CloudFormation.
Rain is currently in preview and shouldn't yet be considered stable enough for production use. Please report any bugs you find through GitHub issues
Rain is also what happens when you have a lot of CloudFormation
Here's what it looks like:

Installing
First, you'll need Go installed.
After that, to install rain, run the following:
go install github.com/aws-cloudformation/rain
License
This library is licensed under the Apache 2.0 License.
Usage
Rain is composed of a number of sub-commands. Invoke a command like this:
rain [command] [arguments...]
The following commands are available:
cat Get the CloudFormation template from a running stack
deploy Deploy a CloudFormation stack from a local template
diff Compare CloudFormation templates
ls List running CloudFormation stacks
rm Delete a running CloudFormation stack
You can get additional information about any command by running:
rain help [command]