Continuous integration (CI) automates building, testing and deploying applications.
When CI is set up well it can dramatically reduce deployment times by eliminating manual steps and ensure code does not have bugs that are being checked by automated tests. Source code changes as a project evolves. CI combined with unit and integration tests check that code modifications do not break existing tests ensure the software works as intended.
Jenkins is a common CI server for building and deploying to test and production servers. Jenkins source code is on GitHub.
Go CD is a CI server by ThoughtWorks that was designed with best practices for the build and test & release cycles in mind. Go CD source code is on GitHub.
Strider is a CI server written in node.js. Strider source code is on GitHub.
BuildBot is a continuous integration framework with a set of components for creating your own CI server. It's written in Python and intended for development teams that want more controller over their build and deployment pipeline. BuildBot source code is on GitHub.
Travis CI provides free CI for open source projects and has a commercial version for private repositories.
Bamboo is Atlassian's hosted continuous integration that is also free for open source projects.
Circle CI works with open or closed source projects on GitHub and can deploy them to Heroku if builds are successful.
Shippable uses Docker containers to speed the build and integration process. It's free for public repositories.
