Freevo is an open source HTPC media centre integrating PVR / DVR funtionality along with music, video, gaming, home automation and more. It is written in python and uses existing popular software such as mplayer, xine and vlc.
AFX is an X11-based, extensible, graphical, and highly configurable frontend primarily for use on tv-connected systems. The original design goal is a joystick-controlled frontend for an entertainment (games, emulators, audio, and video) box.