What are some alternatives?
When comparing AWS CloudFormation and Chef, you can also consider the following products
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Bamboo - Bamboo is a continuous integration and deployment tool that ties automated builds, tests and releases together in a single workflow.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Octopus Deploy - Octopus is a friendly deployment automation tool for .NET developers.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.