Xibo CMS is a full-stack digital signage content management system that enables users to create, schedule, and manage content displayed on screens. The backend is built with PHP (Slim framework, Symfony EventDispatcher, Phinx migrations) and exposes RESTful APIs consumed by a modern React/TypeScript SPA frontend (Vite, TanStack Query, Tailwind CSS). It supports player communication via XMR (message relay) and legacy SOAP-based XMDS. Key features include layout and playlist management, media library, scheduling with dayparting and recurrence, reporting (proof of play, bandwidth, session history), OAuth2 authentication, multi-tenancy via folders and permissions, and a widget/module system with connectors. The codebase is large and actively maintained, with extensive frontend tests (Vitest) and Docker-based development/deployment. However, it carries some technical debt from a legacy jQuery/Bootstrap UI that coexists with the modern React frontend, and a high volume of database migrations indicates long evolution.