DTV: Internet TV on your Mac --from Participatory Culture Foundation.
DTV is a new, free and open-source platform for internet television and video. An intuitive interface lets users subscribe to channels, watch video, and build a video library. Our publishing software lets you broadcast full-screen video to thousands of people at virtually no cost. The project is non-profit, free and open source, and built on open standards. A Windows version of DTV and a full website are well underway and will arrive in the next several weeks.