CsBoard is a small GUI for gnuchess. It is written in C# and uses gtk-sharp and mono. It is simple, but with it you can just play chess with SVG graphics and native look and desktop theme usage. CsBoard has very detailed user documentation and deeply integrated with GNOME desktop environment. CsBoard uses gnuchess as an engine, but you can also play with crafty or phalanx.

License: free

Additional System Requirements: gtk-sharp
mono