This reminded me of Ersatz TV [1], which on checking appears to have gone into maintenance mode a few weeks ago.

I had wanted to use something that lets me set up an EPG with all of the YouTube channels I watch, to see their live streams in a TV guide and see their upcoming streams in a nice grid format. It's probably harder to do this with live stuff than it is to have a set of videos like this site uses.

[1]: https://github.com/ErsatzTV/ErsatzTV