wercker vs. Buildbot vs. Buildkite

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.

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.

CI and build automation tool that combines the power of your own build infrastructure with the convenience of a managed, centralized web UI. Used by Shopify, Basecamp, Digital Ocean, Venmo, Cochlear, Bugsnag and more.