Ebay Open Source represents the range of projects that eBay has contributed to the open-source community. One prominent project under Ebay Open Source is Marko — a modern, fast, and lightweight UI library for building interactive web interfaces. It employs an HTML-like syntax and supports both client and server-side rendering. Marko is designed to be efficient, with a small footprint and a compilation step that produces highly optimized code for faster runtime execution. The project is actively maintained on GitHub, where developers can engage with the codebase, contribute, and utilize Marko for their web projects. Interested developers and contributors can access the project at [https://github.com/marko-js/marko](https://github.com/marko-js/marko), where they can find comprehensive documentation, examples, and guidelines for contributing to the project. Marko exemplifies eBay's commitment to supporting the open-source community and fostering an ecosystem of collaborative software development.