Rain
Rain is a development workflow tool for working with AWS CloudFormation.
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]