Blue Ocean
Seeing how much people recommend other solutions, I've actually moved from Travis to Jenkins, and never looked back.<p>Yes, Jenkins has its issues (crappy UX, poor/awkward docs), but where it shines is the fact it's self-hosted, so I can SSH onto the instance to debug a failing build or replay it with a modified Jenkinsfile on the fly.<p>I'm quite proud of the current setup we have; We're hosting our app with Google's Container Engine (Kubernetes), so what we're doing is on every build Jenkins creates a slave agent within the same cluster (just different node pool) as the production, so the environment in which test containers are ran is identical to production, and what's more it actually talks to the same Kubernetes master, which means I can, for example, test our Nginx Reverse proxy with real backend endpoints and real certificates (that are mounted through glusterfs).