- Woodpecker CI: https://woodpecker-ci.org/

- Drone CI: https://www.drone.io/

- Buildbot: https://buildbot.net/

- Gitea Actions: https://docs.gitea.io/en-us/usage/actions/overview/

- Fogejo Actions: https://forgejo.org/2023-02-27-forgejo-actions/

- GitLab Runners: https://gitlab.com/gitlab-org/gitlab-runner

You could also use Ansible playbooks/roles to run your build, although that's going to be a bit more manual: https://www.ansible.com/

Not necessarily endorsing any of the alternatives, just pointing them out.

How did Apache Maven make it onto this list? Seems like Maven is a build tool that one would invoke _from_ Jenkins or Drone.

That is correct, I removed it from the comment. It's more of an alternative to Apache Ant/make/whatever really.

Which one tells you which test failed and what your code coverage is on one page ?

ssh & Make

Well sure, but ssh and make run from what?

A crontab?

I guess that works if you want your jobs to run on a schedule; I prefer push-based (you make a commit, you push it to the central copy of the repo, and it automatically triggers jobs).