In our 26-criteria evaluation of continuous delivery and release automation (CDRA) providers, we identified the 15 most significant — Atlassian, CA Technologies, Chef Software, Clarive, CloudBees, Electric Cloud, Flexagon, Hewlett Packard Enterprise (HPE), IBM, Micro Focus, Microsoft, Puppet, Red Hat, VMware, and XebiaLabs — and researched, analyzed, and scored them. We focused on core features, including modeling, deploying, managing, governing, and visualizing pipelines, and on each vendor's ability to match a strategy to these features. This report helps infrastructure and operations (I&O) professionals make the right choice when looking for CDRA solutions for their development and operations (DevOps) automation.