Potplayer is good for streaming playlists from youtube. It will show the list of videos in the playlist by pressing f6. now i believe potplay can play urls from other sites, but I don't know which ones
smplayer through using mpv as it's multmedia engine can stream from many sites.
But it falls down in it's playlist option.
If I copy a playlist from say youtube.
It will play the videos in the playlist, but unlike potplayer, it won't display the names of the videos, except for the first one. I was told this is because the videos are really being played through mpv player.