Hearts of Oak: Conquest of the Seas is a non-commercial PC game being developed by PiratesAhoy!, and is to become the historical seafaring game to end them all! Fun, realistic gameplay on land and at sea, set during the Age of Sail, will provide extensive free play, exciting scripted storylines and intense multiplayer scenarios.
Here's a relatively simple test environment to feast your eyes on. The ship is custom built, but most of the other assets are from the engine SDK. CryEngine certainly delivers on the visuals!