Jenkins is described as 'Fork of Hudson and is a continuous build system for software projects' and is a very popular CI/CD system in the development category. There are more than 50 alternatives to Jenkins for a variety of platforms, including Linux, Web-based, Windows, Self-Hosted and SaaS apps. The best Jenkins alternative is GitLab, which is both free and Open Source. Other great apps like Jenkins are Travis CI, TeamCity, Azure DevOps and Azure Pipelines.
Continua CI is an affordable, scaleable Continous Integration Server. Continua CI takes minutes to install and get builds happing, with unit testing, code coverage etc. It has an intuative easy to learn web interface.
pypyr is an open source task-runner for automation pipelines. pypyr lets you script sequential tasks in a simple yaml format with conditional execution, loops, error handling and retries for any step in your pipeline.
Kaholo is a low-code IT workflow automation tool that enables any Developer to self-serve environments and automate their workflows faster without requiring time-consuming scripting and proprietary tool knowledge.
Taskcluster executes tasks where a task is defined in a JSON object and placed on a queue. A worker later claims that task, executes it, and updates the task with the results.
Cider-CI is an application and service stack for highly parallelized and resilient integration testing and continuous delivery.
Vexor is a fast cloud continuous integration service with per-minute billing. It has full GitHub and Bitbucket integration and supports Ruby/Rails, Python, NodeJS, Go, Clojure, Scala and more.
Kraken is a modern, open-source, on-premise CI/CD system that is highly scalable and focused on testing.
Attune 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.
Helping web developers on your team get code merged faster. Full-stack review environments directly in your pull requests.
Automate and Control any software project (SAP, ODI, z/OS,...) from Build to Production, using your own existing tools.
It's a dedicated DevOps solution, not just a anything-goes DIY product.
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Very easy to use and understand for those familiar and comfortable with *nix utilities (which most should be)