There are various programs around that capture and syncronize TV signals that come to your video card, but few as complete as GB-PVR. GB-PVR doesn`t only capture the sound and video of your card, but also acts like a complete multimedia player, able to play audio, video, photos and even syncronize radio broadcasts.
GB-PVR has an interface you can personalize with skins. You can also find a great number of plug-ins and extensions. As for technical characteristics, GB-PVR offers support for various capture cards (possibility to record more than one TV channel at a time), with compatibility with almost all models and brands of cards: Hauppauge PVR250, PVR250MCE, PVR350, ATI Theatre 550 Pro, DVB-T and DVB-S cards, Pinnacle MediaCenter 300i, Twinhan DVB-S and DVB-T, Dvico Fusion DVB-T, V-Box DTT-150, etc.
But the best of GB-PVR is that everything it offers... is totally free!