one of the most advanced Open Source games is IMHO FreeCiv. Some years ago Sebastian Bauer has done a very good port to AmigaOS with a GUI based on MUI. Later itix has improved it and ported it to MorphOS. Since then FreeCiv has improved a lot.
I wonder if there's a capable programmer out there willing to update the MorphOS port based on latest FreeCiv sources ? Even though a MUI version would be my favourite, there's also the probably easier to achive possibility to base a MorphOS port on the now also available SDL based Client.
The main problem with the current MorphOS Client is, that most servers require more up2date Client versions.