Thunderdome Planning Poker is a full-stack web application for agile team collaboration that provides planning poker sessions, retrospectives, story mapping/storyboards, team check-ins, and project management capabilities. The application features a modular Go backend with clean separation of concerns (HTTP handlers, service layer, data access) and a Svelte-based frontend with TypeScript. It includes real-time collaboration via WebSockets, multiple authentication methods (local, LDAP, OIDC, header-based), subscription/billing with Stripe integration, and comprehensive API coverage. The system demonstrates sophisticated technical solutions including a fractional indexing system for maintaining ordered lists and a robust WebSocket hub implementation for real-time features.