Gwydion Dylan
We're currently adding Gtk+ and Gnome support to Gwydion Dylan. If you would like to help, please join the mailing list. If you want to wait, things should be in an experimental but usable state in a few months. We'd eventually like to support DUIM (Harlequin's standard libraries for Dylan user interfaces), perhaps as a wrapper around Gtk+ and Gnome. This probably involves a huge amount of work.