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.
Kbtv is a TV viewer for KDE/FreeBSD. It supports BrookTree/Conexant BT8x8 (bktr) and Philips SAA713x (saa) based analog TV cards, and Philips compatible USB webcams (pwc).
Nuvcr is a digital vcr that records anything any time from anywhere. Use nuvcr to record your favourite TV-shows, movies and more. You can even do it when you're not at home as Nuvcr comes with it's own web interface.