Go.CD vs. Semaphore vs. Buildbot

GoCD is an open source continuous delivery server created by ThoughtWorks. GoCD offers business a first-class build and deployment engine for complete control and visibility.

Whenever somebody pushes new code to GitHub, Semaphore immediately runs all tests on the corresponding branch. Every time you create a new branch, Semaphore builds it automatically. It also knows how to clean up when you delete it.

BuildBot is a system to automate the compile/test cycle required by most software projects to validate code changes. By automatically rebuilding and testing the tree each time something has changed, build problems are pinpointed quickly, before other developers are inconvenienced by the failure.