RetroMac doesn’t just swap the wallpaper: it re-skins the running desktop, dock, and cursor set to match a chosen era, down to Chicago-font title bars and racing-stripe close boxes for the 1-bit System 6 theme. Each theme carries its own cursor pack, not a generic reskin borrowed across all five, and the Snow Leopard theme boots with the real blue-screen-to-grey-Apple startup sequence, click to skip. It’s free, open-source, and under active development.