OSI-licensed only · self-hostable
Jenkins is itself open source (MIT) and remains a widely used automation server with a large plugin catalogue. Teams look for alternatives when they want pipelines defined as simple YAML, container-native execution, Kubernetes integration, or less plugin maintenance.
Every tool below is under an OSI-approved licence (Apache-2.0 or GPL-2.0), checked against its repository. They differ a lot in shape: Woodpecker and Concourse are CI servers, Tekton and Argo Workflows run inside Kubernetes, and Dagger is a portable pipeline engine you can run anywhere there is a container runtime.
Licences checked against each repository on November 7, 2026.
| Tool | Best for | Licence | Runs as |
|---|---|---|---|
| Woodpecker CI | Simple container-based CI with plugin steps | Apache-2.0 | Docker |
| Concourse | Declarative, reproducible pipelines | Apache-2.0 | Docker |
| Tekton Pipelines | CI/CD building blocks on Kubernetes | Apache-2.0 | Server |
| Argo Workflows | Parallel jobs and DAG workflows on Kubernetes | Apache-2.0 | Server |
| Buildbot | Python-scripted CI for complex build farms | GPL-2.0 | Server |
| Dagger | Pipelines you can run identically locally and in CI | Apache-2.0 | Docker |
| Harness Open Source | Code hosting and pipelines in one platform | Apache-2.0 | Server |
Best for: Simple container-based CI with plugin steps
A simple yet powerful CI/CD engine with great extensibility. Extended through plugins, uses SQLite by default, and the README estimates about 100 MB of RAM for the server and 30 MB for the agent when idle.
Best for: Declarative, reproducible pipelines
An automation system written in Go for CI/CD that scales from simple to complex pipelines. Pipelines are declarative YAML, operated mostly through the fly CLI, and workers are stateless and container-based.
Best for: CI/CD building blocks on Kubernetes
Provides Kubernetes-style resources for declaring CI/CD pipelines. Cloud-native and decoupled: one pipeline can deploy to any Kubernetes cluster and tasks can run in isolation.
Best for: Parallel jobs and DAG workflows on Kubernetes
An open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Workflows can be DAG- or step-based, with a UI, a CLI, a REST API and cron scheduling.
Best for: Python-scripted CI for complex build farms
A Python-based continuous integration framework with master and worker components and web views such as console and waterfall. Configuration is done in Python rather than a GUI.
Best for: Pipelines you can run identically locally and in CI
An automation engine to build, test and ship any codebase, locally, in CI or in the cloud. Pipelines are written in code with SDKs for eight languages, run in containers and are cached by their inputs.
Best for: Code hosting and pipelines in one platform
An open source development platform combining code hosting, automated DevOps pipelines, hosted development environments (Gitspaces) and artifact registries. The repository is licensed Apache-2.0.
One email a week with the open-source projects, launches and releases added to TechLogHub. Unsubscribe in one click.
One email a week: new and trending developer tools, fresh comparisons, and what shipped. Unsubscribe in one click.
| If you need… | Start with |
|---|---|
| A lightweight CI server with YAML pipelines | Woodpecker CI |
| Strictly declarative, reproducible pipelines | Concourse |
| CI/CD that runs natively on Kubernetes | Tekton or Argo Workflows |
| Parallel data or batch workflows on Kubernetes | Argo Workflows |
| Pipelines as real code that run the same locally | Dagger |
| Replace GitHub and Jenkins together | Harness Open Source |
Quick answers to common questions
Yes. Jenkins is licensed under the MIT License. The alternatives here are for teams who want a different pipeline model, not because Jenkins is closed.
Woodpecker CI is a good starting point: pipelines are simple YAML, steps run in containers, and it uses SQLite by default so a small server is enough.
Tekton Pipelines and Argo Workflows are both built for Kubernetes and need a cluster. Tekton provides CI/CD building blocks, while Argo Workflows focuses on orchestrating parallel jobs.
Not automatically. Each tool has its own pipeline syntax, so Jenkinsfiles need to be rewritten. Dagger lets you express pipelines in a general-purpose language, which some teams find easier to port.
Woodpecker CI extends through plugins and publishes a plugin overview site, and Buildbot is extensible in Python. None match Jenkins's plugin catalogue in size, so check that the integrations you rely on exist before switching.
List it on TechLogHub and we'll review it for this page.
