GoCD
Main repository for GoCD, continuous delivery server
...No plugin required, out of box CD. GoCD helps you troubleshoot a broken pipeline by tracking every change from commit to deploy in real time. Compare content, both files and commit messages, across any two arbitrary builds. GoCD integrates with many popular external tools and services via its extensible plugin architecture. We have put a lot of thought into making sure GoCD upgrades are painless and non-breaking even when you are using plugins.