MacOS up until Catalina Windows 7 with the Shine 2.0 theme Gnome Adwaita QNX Photon 6 BeOS R5 I'm sure there's more good examples. People here will say Win

MacOS up until Catalina Windows 7 with the Shine 2.0 theme Gnome Adwaita QNX Photon 6 BeOS R5 I'm sure there's more good examples. People here will say Windows 2000, but I don't think it has any grace.