There have been threads about this in the past, but they always die quickly. Oh well, making a new one.
Guns of Icarus Online is a steampunk/dieselpunk, multiplayer, first-person shooter that focuses on airship combat. Each airship is controlled by up to four players, with each member of the crew taking a specific role. Players can choose three different classes: gunner, engineer or pilot, which will allow them access to different kinds of tools. The captain of each ship chooses which weapons to use in his/her ship. There are also several ships available:
Galleon: the Galleon is by far the biggest and more resilient ship. It is however, the slowest. It focuses on high firepower and tank capabilities.
Squid: the Squid is the fastest ship in the game which allows its commander to outmaneuver enemy ships. It is also one of the weakest.
Goldfish: the Goldfish has a main gun on its prow, and two secondary guns on the port and starboard sides. It relies on its moderate speed and high maneuverability.
Junker: the Junker has 5 small weapon mountings and a slow speed but high maneuverability.
Pyramidion: the Pyramidion has two guns on the top deck and two on the low deck. With very high damage output but slow turning speed this ship is very versatile.
Spire: the Spire has a very high turning speed but a very low linear speed. It is a high dps ship with very low hull armor.
Mobula: the Mobula has 5 weapons on the front and none on the sides or the back. It has great vertical movement, but is hard to repair in the heat of the battle.
It's not that popular although a few famous youtubers have made videos of it, but it's pretty addicting. Also surprisingly balanced.
Some pics
Steam link
http://store.steampowered.com/app/209080/