I purposely left off a lot that has fallen by the wayside. Sopcast and Veetle are by far the most popular today. Veetle is for all intents and purposes Flash based P2P and so it's very popular.

With Adobe's decision to dump support for smartphones, tablets and TVs, we're likely to see a huge push from them in this market, as IIRC they enabled P2P technologies in flash a while back. If Sopcast releases a browser based version, I see no reason why it can't rule the space given it's already overwhelming popularity.