Chess24 has had 3 top 25 GMs narrating together for the last few games. Tomorrow's live stream is at https://youtu.be/HBvQ36SqgqM.

Note: If it wasn't clear, that stream will not literally be of Carlsen & Caruana. It mirrors the current position in the game and has commentators analyze it. I don't think a free livestream exists that shows Carlsen & Caruana live, making the moves.

Chess.com also has a livestream on their Twitch channel (https://www.twitch.tv/chess) with the live board and analysis by IM Daniel Rensch and GM Robert Hess with other guests like GM Nakamura, GM Hou Yifan, GM Levon Aronian and so on.

World chess (https://worldchess.com) has live streaming with Judith Polgar commenting.

Chess24 also has the same with Peter Svidler, Guramishvili, Anish Giri and Grischuk commenting.

I watched all streams listed in the comments, but I liked the most GM Jerry: https://www.twitch.tv/chessnetwork

Stanford Chess team is streaming live now: http://twitch.tv/stanfordchess/

Currently streaming is head coach and former World Youth Champs silver medalist NM Jordy Mont-Reynaud. We may be joined later by our team captain, GM Daniel Naroditsky aka RebeccaHarris on LiChess aka "guy who is known to beat Magnus Carlsen at bullet"

Join us for commentary/questions/banter!