Best Open-Source CI/CD Tools 2026: 7 Options Compared

Continuous integration and delivery tools fall into two groups, and mixing them up leads to confusion. Build and test runners, such as Jenkins, Concourse and Woodpecker CI, watch your repository and run jobs. Kubernetes-native tools, such as Tekton, Argo Workflows and Argo CD, assume you already run a cluster and use it for everything. Argo CD is only about delivery: it keeps a cluster in line with what is in Git and does not build anything. Jenkins is the veteran, extremely flexible through plugins, though plugin upkeep is the main cost. Woodpecker is a lighter option that began as a fork of Drone and uses simple pipeline files. Concourse runs every job in a container and favors strict, declarative pipelines. Gitea includes its own Actions-style runner, handy if you already host code on it. The trade-off is operations against features. A hosted service from your code platform costs little and needs no maintenance, so self-hosting only makes sense when you want control over runners, secrets or data location, or need to run on your own hardware. If you do self-host, size the machines for peak builds and plan upgrades, because a neglected build server becomes a security risk.

Jenkins

MIT-licensed, free and self-hosted. The plugin ecosystem is large, and also the main maintenance cost.

Price: Free (Jenkins pricing, checked 2026-10-22).

Platforms and license: Self-hosted (Java, any OS with a JDK). MIT (open source) (license source).

Project activity: 26.7k GitHub stars · latest release jenkins-2.587 (Oct 20, 2026) · last commit Oct 27, 2026

Best for: Teams with varied build needs.

Worth knowing: Free and self-hosted. The repo LICENSE.txt is MIT. Plugin ecosystem is the main maintenance cost.

Compare: Jenkins alternatives

Woodpecker CI

Apache-2.0 lightweight CI that began as a fork of Drone. Simple pipeline files and a modest footprint.

Price: Free (Woodpecker CI pricing, checked 2026-10-23).

Platforms and license: Self-hosted (Linux, Docker). Apache-2.0 (open source) (license source).

Project activity: 8.1k GitHub stars · latest release v3.19.0 (Oct 7, 2026) · last commit Oct 27, 2026

Best for: Small teams wanting a light server.

Worth knowing: Self-hosted continuous integration tool that began as a fork of Drone. Free under Apache-2.0; the repo states the docs are CC BY-SA 4.0.

Concourse CI

Apache-2.0 pipeline CI where every job runs in a container. You run the web and worker nodes yourself.

Price: Free (Concourse CI pricing, checked 2026-10-22).

Platforms and license: Self-hosted (Linux). Apache-2.0 (open source) (license source).

Project activity: 7.9k GitHub stars · latest release v8.3.2 (Oct 23, 2026) · last commit Oct 27, 2026

Best for: Strict, declarative pipelines.

Worth knowing: Pipeline CI where every job runs in a container. Apache-2.0; you run the web and worker nodes yourself.

Gitea

MIT self-hosted code platform, free for unlimited users and repositories. Gitea Enterprise is separate and priced per user.

Price: Free (Free (open source edition, self-hosted, described as unlimited users and repositories)) (Gitea pricing, checked 2026-10-22).

Platforms and license: Self-hosted server. MIT (open source) (license source).

Best for: Teams that want code and CI together.

Tekton Pipelines

Apache-2.0 Kubernetes-native building blocks for pipelines, defined as cluster resources. Needs a cluster and some YAML tolerance.

Price: Free (Free open-source software) (Tekton Pipelines pricing, checked 2026-10-24).

Platforms and license: Kubernetes. Apache-2.0 (open source) (license source).

Project activity: 9.1k GitHub stars · latest release v1.17.1 (Oct 23, 2026) · last commit Oct 26, 2026

Best for: Platform teams building on Kubernetes.

Worth knowing: Kubernetes-native pipeline resources; you define tasks and pipelines as cluster objects.

Argo Workflows

Apache-2.0 engine that runs each step of a workflow as a Kubernetes pod. Needs a cluster.

Price: Free (Argo Workflows pricing, checked 2026-10-22).

Platforms and license: Kubernetes. Apache-2.0 (open source) (license source).

Project activity: 17.1k GitHub stars · latest release v4.1.6 (Oct 22, 2026) · last commit Oct 27, 2026

Best for: Batch and ML jobs on Kubernetes.

Worth knowing: Runs each workflow step as a Kubernetes pod. Apache-2.0; needs a Kubernetes cluster.

Argo CD

Apache-2.0 continuous delivery for Kubernetes that syncs a cluster with Git. It deploys but does not build, so pair it with a CI tool.

Price: Free (Free open-source software) (Argo CD pricing, checked 2026-10-24).

Platforms and license: Kubernetes. Apache-2.0 (open source) (license source).

Project activity: 24.5k GitHub stars · latest release v3.5.6 (Oct 20, 2026) · last commit Oct 27, 2026

Best for: GitOps deployments.

Worth knowing: Declarative continuous deployment for Kubernetes. It deploys; it does not build, so pair it with a CI tool.

Which one to pick

• You want maximum plugin choice: Jenkins
• You want a small CI server: Woodpecker CI
• You already host code on Gitea: Gitea
• You deploy to Kubernetes from Git: Argo CD
• You build pipelines inside a cluster: Tekton Pipelines