Ansible is a radically simple IT automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and many other IT needs.
Chef is an open source systems integration framework built to bring the benefits of configuration management to your entire infrastructure. You write source code to describe how you want each part of your infrastructure to be built, then apply those descriptions to your servers.
RunDeck is an open source automation service with a web console, command line tools and a WebAPI. It lets you easily run automation tasks across a set of nodes.
The CTO.ai platform allows you and your software development team to implement DevOps automations in minutes rather than days by runnings "Ops" in Slack and the CLI. Leverage a curated inventory of DevOps workflows to adopt int your development cycles.
pypyr is an open source task-runner for automation pipelines. pypyr lets you script sequential tasks in a simple yaml format with conditional execution, loops, error handling and retries for any step in your pipeline.