Tabbycat is a Django web application for managing debate tournaments, supporting both British Parliamentary and two-team formats. It provides comprehensive tournament management features including draw generation (power-paired, round-robin, elimination, random), adjudicator allocation (Hungarian algorithm, preformed panels), ballot entry and results computation, speaker and team standings, break qualification, check-ins, notifications, and venue management. The system uses a monolith architecture with Django REST Framework for API access, Django Channels for real-time updates (WebSockets), and a Vue.js frontend for interactive drag-and-drop interfaces. It is deployed with PostgreSQL, Redis, and Nginx, and supports Docker and Heroku deployment. The codebase is well-structured with extensive use of mixins, base classes, and design patterns, though it exhibits some tight coupling between apps and a large migration history.