Backstage is an open source platform for building developer portals that unifies all tooling, services, apps, data, and documentation with a single consistent UI. It allows developers to focus on their work by providing a centralized location to create software, manage what they own, and explore the entire software ecosystem. Backstage has a customizable, extensible plugin architecture built with modern technologies to make it easy to develop for and contribute to developer portals in a cloud-agnostic, vendor-neutral way.