Pi4 for HomeAssistant + audio streamer with a HiFiBerry card, with external SSD, google Coral stick for Frigate, and a Zwave stick. Running OSMC as OS.
Pi3b with OSMC as audio streamer
Small fanless HTPC on a six year old Apollo lake mini ITX mobo. Looking forward to upgrading this one soon with one of the recently announced alderlake N100 fanless mini itx mobos.