A computer running Windows 7, 8 or 10.
Daz Studio for Windows (free).
MacOS is not supported but you can run Windows in a VM such as Parallels or VMWare Fusion. Note that in this case you need to install Daz Studio in the Windows environment as well in order to specify your Daz content directories for FaceGen Artist.
Linux is not supported but some customers have had success with WINE.