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Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
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.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Buildbot - Python-based continuous integration testing framework
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.