Ansible (Automation for Everyone)
Ansible is a radically simple IT automation system. It handles configuration-management, application deployment, cloud provisioning, ad-hoc task-execution, and multinode orchestration – including trivializing things like zero downtime rolling updates with load balancers.
Terraform provides a common configuration to launch infrastructure — from physical and virtual servers to email and DNS providers. Once launched, Terraform safely and efficiently changes infrastructure as the configuration is evolved.
Simple file based configuration gives you a single view of your entire infrastructure.