RunDeck - RunDeck is an open source automation service with a web console, command line tools and a WebAPI.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Apache Airflow - Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.