This is an OpenStack style project that provides a REST API to orchestrate multiple cloud applications implementing well-known standards such as AWS CloudFormation and TOSCA.
Currently the developers are focusing on AWS CloudFormation but are watching the development of the TOSCA specification.
Why heat? It makes the clouds rise and keeps them there.
If you'd like to run from the master branch, you can clone the git repo:
git clone firstname.lastname@example.org:heat-api/heat.git
Follow the steps: https://github.com/heat-api/heat/wiki/HeatGettingStarted