Skyrim Together is a multiplayer mod that will let you and your friends play the game from start to finish together. The mod will let you explore the world of Skyrim with up to Eight Players. The mod has been in work for quite a while now and has been updated with new features for a game that was built as a single-player experience. Bethesda had shut down the mod in the past but allowed the devs to work on it only if they won't use Steam's API.
Here’s ESO video on Skyrim Together:
The team behind Skyrim Together had to develop their own third-party tools for social aspects of the game. The game is now ready for an open beta, which will be offered to their Patreon backers. Once the Patreon beta goes well and the team is satisfied with the mod performance, the beta will be open to everyone.
Each session will be capped at eight players. The mod will both with Skyrim and Skyrim: SE. Other mods will be compatible too except for those that offer graphics enhancements. Current servers are located in Europe, but the team plans to add more once they figure out how many players are interested in playing the mod.
You can check out more info about the mod by checking out the Skyrim Together Official Subreddit.