Last Horizon http://www.last-horizon.com/
Last Horizon is multiplayer online strategy game.
In the Last Horizon Universe you can build huge numbers of different shiptypes. Those shiptypes all have a class ( Fighter, Corvette, Frigate, Destroyer, Cruiser, Battleship).
Science and Buildings are vital to advancement in technology. Different science and building will determine what you can and cannot produce in the game.
Science Activites and Building follow one after another. Completing a science item will allow you to start a building following that science down the part of the Tech Tree.