The best open source alternative to GitLab is Gitea. If that doesn't suit you, we've compiled a ranked list of other open source GitLab alternatives to help you find a suitable replacement. Other interesting open source alternatives to GitLab are: Harness and Semaphore.
GitLab alternatives are mainly CI/CD Platforms but may also be Git Platforms or PaaS & Deployment Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of GitLab.
A lightweight, fast, and customizable Git service that simplifies code hosting and collaboration for teams of all sizes.

Gitea is a powerful, open-source Git service that puts you in control of your code. With its intuitive interface and robust features, Gitea makes version control and collaboration effortless for developers and teams.
Key benefits of Gitea include:
Whether you're an individual developer, a small team, or a large organization, Gitea provides a flexible and powerful platform for managing your Git repositories and fostering collaboration.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Streamline code delivery with an open-source CI/CD platform featuring Git integration, fast pipelines, and hosted development environments.

Harness Open Source is a comprehensive software delivery platform that empowers developers to streamline their entire development workflow. From code repositories to deployment, this open-source solution offers a centralized hub for managing your software projects.
Key features include:
Benefits:
Whether you're a small team or a large enterprise, Harness Open Source provides the scalable features needed to meet your software delivery demands while maintaining developer autonomy and efficiency.
Continuous integration and delivery platform offering faster builds, lower costs, and maintenance-free operations. Cut build times dramatically while reducing CI/CD expenses by 50%.

Open source CI/CD platform designed to help development teams ship software faster with enhanced quality and security. Unlike traditional solutions, Semaphore offers a maintenance-free alternative to Jenkins with no plugin updates required and single installation for entire organizations.
Key performance benefits include dramatic build time reductions - teams report cutting builds from over 1 hour to just 10-12 minutes. The platform costs 50% less than GitHub Actions while delivering 2x faster performance, making it an economical choice for teams of all sizes.
Advanced features include:
The platform supports enterprise-grade scalability - Confluent successfully migrated 1,800 engineers from dozens of Jenkins installations to a single Semaphore instance. Free Enterprise tier available for small teams, with comprehensive documentation and local development support through Skaffold integration.