Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
IBM UrbanCode Release - IBM UrbanCode Release is a collaborative release management tool.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.