Buildbot vs. Snap CI vs. wercker

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.

Snap CI is a cloud-based continuous integration & continuous deployment tool with powerful deployment pipelines. Integrates seamlessly with GitHub and provides fast feedback so you can deploy with ease.

Wercker integrates with your favorite developer platforms out there, such as GitHub and Bitbucket. When you are ready to deploy your application, wercker enables you to deliver your application to cloud platforms like Heroku, OpenShift and Amazon Web Services.