Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Bitrise - Tens of thousands of agencies, startups and enterprise companies with mobile apps - including Runkeeper, Grindr, Duolingo and more - use Bitrise to automate their way to increased productivity & speed
Chef - Automation for all of your technology. Overcome the complexity and rapidly ship your infrastructure and apps anywhere with automation.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine