Tamriel Online - Skyrim LAN Multiplayer
Tamriel Online is a wip mod that will let you play Skyrim with your friends. This mod aims to allow multiple people to play together, with/without the same mods, in the simplest way possible. We at nocturnal gaming have been following Siegfre progress for the last year.
In this time Siegfre has re built the scripts from the ground up and has now created a rather stable release of skyrim coop.
Download it here.