Jenkins is a fork of Hudson and is a continuous build system for software projects.

Attune is described as 'Enables you to build an entire virtual or physical server over Windows or Linux and where your team can build or deploy files easily. One of the exciting features of Attune is Document Generation, facilitating your team to export automated procedures as manual documents' and is an app. There are 2 alternatives to Attune for Linux, BSD, Self-Hosted, Mac and Windows. The best Attune alternative is Jenkins, which is both free and Open Source.
Jenkins is a fork of Hudson and is a continuous build system for software projects.

Earthly is a CI/CD framework that allows you to develop pipelines locally and run them anywhere. Earthly leverages containers for the execution of pipelines. This makes them self-contained, repeatable, portable and parallel.
