CodeShip is also a SaaS and is, "Forever free: You can use up to 100 builds per month for free, with unlimited projects and unlimited team members."
We are also working at CloudBees to have CodeShip support the emerging Jenkins X Pipeline syntax (YAML that mirrors the functionality of the Jenkins Pipeline). This syntax was based on the Tekton project, driven by the Continuous Delivery Foundation and significantly influenced by Jenkins developers like Andrew Bayer and Devin Nusbaum and by their PM, Nofar Bluestein.
100 builds per month ? I have more then that in a day for medium size projects!
No, nothing in the cloud, no system you don't fully control is an option in my IT business. Forever. The only thing I tolerate is something totally irrelevant most of the time, (like statuspage maybe), easily replaceable and package repositories (but only because you can install local proxy so once pulled is on premise FOREVER).
We are also working at CloudBees to have CodeShip support the emerging Jenkins X Pipeline syntax (YAML that mirrors the functionality of the Jenkins Pipeline). This syntax was based on the Tekton project, driven by the Continuous Delivery Foundation and significantly influenced by Jenkins developers like Andrew Bayer and Devin Nusbaum and by their PM, Nofar Bluestein.