ReleaseHub (now branded Release) is a release orchestration and deployment platform founded in 2014 in the USA, featuring git-push deployments, full-stack ephemeral environments, and deploy-to-your-own-cloud.
CloudBees is an enterprise software delivery platform (US, founded 2010) built on Jenkins, offering CI/CD, feature management, and release orchestration, with CloudBees Unify governing pipelines across hybrid and multi-cloud environments, serving Salesforce, Autodesk, and Visa.
Buddy is a CI/CD platform founded in Warsaw, Poland in 2014, featuring a drag-and-drop visual pipeline, native Docker/Kubernetes deployment, and parallel builds, with deep integration for GitHub, GitLab, and Bitbucket.
Travis CI is a hosted CI service founded in Berlin in 2011 and one of the first to deeply integrate with GitHub, automating build and test via a single .travis.yml file, free for open source.
Bitbucket is a Git code-hosting and CI/CD platform founded in 2008 and now part of Atlassian, letting 10M+ users close the loop from code to deployment with unlimited private repositories and Bitbucket Pipelines, deeply integrated with the Jira ecosystem.