Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Salt - Fast, scalable and flexible software for data center automation
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
Cobbler - Cobbler is a Linux installation server that allows for rapid setup of network installation...
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.