GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.

Rudder - Rudder is an easy to use, web-driven, role-based solution for Continuous Automation and Compliance.

GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab

Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine

BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.

Chef - Automation for all of your technology. Overcome the complexity and rapidly ship your infrastructure and apps anywhere with automation.