PyChess - a free chess client for Linux
The mission of PyChess is to create a free, pleasant, pygtk chess game for the Linux desktop that does everything you require from an advanced chess client.
Project homepage: http://pychess.org/
Download page: http://pychess.org/download/
Development page: https://github.com/pychess/pychess
Translations: https://www.transifex.com/projects/p/pychess/
Mailing list: http://groups.google.com/group/pychess-people