Nextcloud — Files & collaboration core Collabora Online — Office documents Talk HPB — High-performance signalling for video/audio Whiteboard — Real-time collaborative whiteboard Stalwart — Per-tenant mail server Imaginary — On-demand image previews coturn — STUN/TURN for Talk calls nginx — Web frontend sidecar Valkey — Cache & file locking MariaDB — Nextcloud database Garage — Distributed S3 object storage Traefik — Ingress / Gateway API Let's Encrypt — TLS certificate authority cert-manager — Certificate lifecycle Kubernetes — Cluster orchestration Grafana — Observability dashboards