LibraryOS is a full library management system with a public catalogue. Members search the whole collection by title, author or ISBN, see real-time shelf availability (copies on the shelf vs on loan), browse by subject, and place holds with an automatic queue that notifies them when a copy is ready to collect. Book pages show loan periods, renewal limits, late fees and shelf locations, while staff and members sign in to manage circulation. Built with Laravel, PHP and MySQL with a clean, fully responsive UI.