Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Ansible Semaphore - Modern UI for Ansible
Salt - Fast, scalable and flexible software for data center automation
Ansible tower - An ansible web frontend.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
RunDeck - RunDeck is an open source automation service with a web console, command line tools and a WebAPI.