Kung Fu Chess is an online, real-time chess game without turns. Use a combination of strategy and speed to defeat your opponent. Play against AI of increasing difficulty, your friends, or people online.
PyChess is a gtk chess client, originally developed for GNOME, but running well under all other linux desktops. (Which we know of, at least). PyChess is 100% python code, from the top of the UI to the bottom of the chess engine.