I've worked a lot with Ooyala's live streams and was just looking at moving a client over to their HTML5 offering. They claim to offer it in all browsers but that is probably with a flash fallback, they haven't open sourced their JS (or at least I can't see it on their GitHub page).
We also use StreamUK on a lot of sites (but I've never used it directly) and from what I have heard they have great support for HLS. They have no GitHub presence so not quite sure if they're using the same libs the article mentioned or something proprietary.
Obviously DRM would still be an issue unless the browser natively supports EME.