Top 3 Open source Alternative (Similar) to Travis CI

Jenkins is an open-source automation server that enables developers worldwide to build, test, and deploy their software reliably. Jenkins provides hundreds of plugins to support building, deploying, and automating any project.

• Continuous Integration and Continuous Delivery: As an extensible automation server, Jenkins can be used as a simple CI server or the continuous delivery hub for any project.
• Easy installation: Jenkins is a self-contained Java-based program, ready to run out-of-the-box, with packages for Windows, Linux, macOS, and other Unix-like operating systems.
• Easy configuration: Jenkins can be easily set up and configured via its web interface, including on-the-fly error checks and built-in help.
• Plugins: With hundreds of plugins in the Update Center, Jenkins integrates with practically every tool in the continuous integration and continuous delivery toolchain.
• Extensible: Jenkins can be extended via its plugin architecture, providing nearly infinite possibilities for what Jenkins can do.
• Distributed: Jenkins can efficiently distribute work across multiple machines, helping drive builds, tests, and deployments across multiple platforms.

Spinnaker provides application management and deployment to help you release software changes with high velocity and confidence. Spinnaker is an open-source, multi-cloud continuous delivery platform that combines a powerful and flexible pipeline management system with integrations with the major cloud providers.

• Automated Releases: Create deployment pipelines that run integration and system tests, spin up and down server groups, and monitor your rollouts. Trigger pipelines via git events, Jenkins, Travis CI, Docker, CRON, or Spinnaker pipelines.
• Built-in Deployment Best Practices: Create and deploy immutable images for faster rollouts, easier rollbacks, and the elimination of hard to debug configuration drift issues.
• Multi-Cloud: Deploy across multiple cloud providers, including AWS EC2, Kubernetes, Google Compute Engine, Google Kubernetes Engine, Google App Engine, Microsoft Azure, Openstack, Cloud Foundry, and Oracle Cloud Infrastructure

Tekton is a powerful and flexible open-source framework for creating CI/CD systems, allowing developers to build, test, and deploy across cloud providers and on-premise systems.

• Standardization: Tekton standardizes CI/CD tooling and processes across vendors, languages, and deployment environments. It works well with Jenkins, Jenkins X, Skaffold, Knative, and other popular CI/CD tools.
• Built-in best practices: Tekton lets you create CI/CD systems quickly, giving you scalable, serverless, cloud-native execution out of the box.
• Maximum: flexibility Tekton abstracts the underlying implementation so that you can choose the build, test, and deploy workflow based on your team’s requirements.