Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Terraform - Tool for building, changing, and versioning infrastructure safely and efficiently.
Packer - Packer is an open-source software for creating identical machine images from a single source configuration.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.