

Router: opnsense/pfsense
Switch: I guess look at something like Open vSwitch After some more reading I would go for a proprietary managed switch here.
WiFi/Mesh network: OpenWrt with 802.11r setup - https://openwrt.org/docs/guide-user/network/wifi/roaming
Server: Proxmox or Debian Bookworm with KVM/Qemu
Docker/Kubernetes: Portainer CE version as a VM in Proxmox - https://github.com/portainer/portainer
Collab software: https://github.com/nextcloud/server
Server Backup: Proxmox backup server or Borg backup/Restic
Client backup: Borg backup/Restic
https://github.com/yt-dlp/yt-dlp