Holdfast: Nations At War (Napoleon Era Multiplayer)
For some reason this one slipped under the radar for me, it's going into Steam Early Access on September 21st! It basically is allot like the Napoleonic War mod for Mount And Blade: Warband, but the difference is in this game you can join the navy as well!
"Holdfast: Nations At War is an online multiplayer first and third person shooter focusing on a combination of teamwork and individual skill. Take part in historic clashes on land and at sea waged by the most powerful nations during the great Napoleonic Era.
"Command and crew historically inspired sailing vessels in powerful duels or within squadron operations where cooperation in running your vessels leads to victory. War at sea is an entirely different setting and these clashes will take place off the coast in a selection of beautiful arenas."
"Take the King’s shilling or fight for the Emperor in glorious Napoleonic field battles. Join the ranks and keep the line steady or provide support from the rear with cannon fire as you strive for dominance over the battlefield."