Brief descriptions provided below. For detailed descriptions, click on the Stargate Wikia link above.They provide much more in detail including the craft's defenses, engine systems, weaponry, history, and much more.
Ancients - City Ship
A city-ship is a mobile city used by the Ancients. With roughly the same internal space as is found on Manhattan island, city-ships are one of the largest vessels in the known universe. They are also formidable battleships, although their effectiveness is severely reduced when in space.
The Ancients were already using city-ships several million years ago, when they departed Antarctica for the Pegasus galaxy aboard the city-ship Atlantis. At least one other Ancient built city-ship is known to exist in Pegasus; whether it was constructed there or was part of the Ancients' original migration is unknown.
A city-ship's design much more closely resembles that of a modern city than a spacecraft, with systems and living quarters distributed throughout several towers that extend away from the drive system; while in flight, the top of a city-ship would be considered the "front."
All known city-ships are capable of planetary landing; and indeed, they do not seem to have been designed primarily to function in space. Their hulls are not airtight, at least not in the majority of the ship, requiring the use of a shield to maintain atmosphere.
Ancients - Aurora-class Battleship
The Aurora-class battleship was a series of Lantean battleships used during their war with the Wraith. The Atlantis expedition first encountered this class of ships in the form of the Aurora, and only four have been encountered since the fall of the Lanteans, excluding those built by the Asurans. The Lantean name for this class of ship has never been revealed.
Built by the Lanteans during their war against the Wraith, the Aurora-class is considered to be among the most advanced class of warship ever created, with only the Asgard-modified Daedalus-class seen to rival the power of at least older varients.
It is unknown how an Ori mothership or the Asgard O'Neill-class would fare against one of these vessels, but at peak capacity just one of them is more than a match for an entire fleet of Wraith hive-ships or Goa'uld Hataks.
The Apollo is the fourth 304 produced by the United States, and the third operated by the U.S. Air Force, assigned to the Second Tactical Wing. Like its sister ship, the Daedalus, it was deployed to the Pegasus galaxy shortly after its commissioning, and provided assistance to the Atlantis expedition there.
The Apollo was rushed into service when several Ori motherships made their way towards Earth, with the ship posted to defend the planet. However, the ship never saw battle as the Ori ships stayed outside the Solar system and the Ori were already defeated by the Ark of Truth. Sometime after that, the ship was sent to serve Atlantis. (Stargate: The Ark of Truth)
On its first voyage to Atlantis, the Apollo arrived ahead of schedule, impressing Doctor Elizabeth Weir. The ship's first mission was to destroy a fleet of ships being constructed by the Asurans, presumably to be used in an attack against Earth.
Asgard Mother Ship
The Bilskirnir-class, also known as an Asgard mothership, was a series of spaceships used by the Asgard at the height of their power. Bilskirnir-class motherships were the primary type of ship used by Asgard race. They had a distinctive shape with a hammer style front with wings by the side and a grayish hull.
The sensors of these ships were quite accurate and capable of detecting movements within the vessel should intruders board the craft. This included a type of thermal sensor which allowed for the detection of warm blooded organisms moving about the ship in case the primary internal sensors were disabled.
They possessed an automated medical system that allowed for the healing of injured crewmen. However, it was possible to tamper with the system which was capable of killing an Asgard in the process. It included at least one medical stasis pod that can be used by the ship's Asgard commander in the event of a dire emergency.
The Daedalus is the first 304 produced by the Tau'ri, and the second generation of interstellar capital ship developed by the United States military and its allies, assigned to the Fast Attack Wing. Commanded by Colonel Steven Caldwell, her standard mission has been to ferry equipment and personnel between Earth and Atlantis, assisting the expedition team there as needed.
The Daedalus is armed with 32 railguns, Mark-8 and 9 tactical warheads, and a bay of F-302 fighters. It also possesses Asgard shielding and beaming technology. Unlike its predecessor, the Prometheus, the Asgard defensive equipment was installed during the ship's production rather than added after the fact.
Following the extinction of the Asgard race, it was retrofitted with Asgard plasma beam weapons. Originally, to ensure that their technologies were not abused, the Asgard provided an engineering expert to monitor the ship's systems for the first two years of its operation.
Destiny is a ship in the Ancient fleet, constructed and launched over fifty million years ago from Earth. The Ancients launched several automated ships prior to Destiny, each with the purpose of constructing and seeding Stargates throughout the numerous galaxies they crossed, with Destiny itself following in their path to explore those planets.
After beginning this process, the Ancients initially planned to wait until the ship reached a sufficient distance from Earth to board it and explore the universe. However, because of other endeavors, such as ascension, they never followed through on the plan.
Because of this, Destiny has continued on a pre-programmed path on its journey throughout the stars, alone, for millions of years. With the arrival of the Tau'ri in 2009, Destiny now has a crew.
The Ha'tak is a Goa'uld spaceship and the mainstay of their fleet. It serves a dual role as a mothership and a heavy attack vessel. The Ha'tak is one of the most powerful ships in the Goa'uld fleet, only second to the larger and quite rare flagships employed by System Lords.
However, compared to other capital vessels such as those of the Asgard, Ancients, Ori, and the Asgard-upgraded Tau'ri fleet, they are rather underpowered. As with most Goa'uld technology, Ha'taks are also used by the Free Jaffa Nation and the Lucian Alliance. The Tok'ra rarely make use of them, as such a conspicuous vessel is not in keeping with their methods.
The Ha'tak consists of two sections: the main section is a golden tetrahedron built into the center of the vessel, evocative of an Egyptian pyramid, containing the majority of the primary systems as well as the command areas and glider bay. Built around the pyramid is a much larger, triangle-shaped superstructure, which wraps around the center of the pyramid.
The Odyssey, registry PB3865, is Earth's second 304 class battlecruiser, replacing the Prometheus as Earth's primary planetary defense and exploration vessel in the Milky Way. After the destruction of Prometheus, and with Daedalus usually in the Pegasus Galaxy, Earth was left without a suitable ship for defense and exploration.
Odyssey, under construction at Area 51, was to fill this void. Under the command of Colonel Paul Emerson, she was launched prematurely to retrieve SG-1 who had been captured off-world by operatives of the Lucian Alliance.
The mission was a success, but the skills of Odyssey had to be proven when SG-1 had to retrieve stolen Stargates from Ba'al. Intercepting Ba'al's Ha'tak, Odyssey confronted both Ba'al's Ha'tak and three Lucian Ha'tak vessels.
She was able to retrieve the Stargates with assistance by SG-1 and was able to escape the battle between Ba'al and the Alliance. Odyssey was, again, sent out on duty to retrieve SG-1 and a group of IOA members who were trapped at the Gamma Site after R-75 insect specimens mass produced and became carnivorous.
An Ori warship was the standard attack vessel used by the Ori during their crusade in the Milky Way. These white colored vessels are some of the largest ever encountered by the SGC being much bigger then the 304 and Ha'tak vessels as well as one Asgard vessel.
They consisted of an oval shaped structure with a large Stargate styled ring in the center which glows with a white light. Two engines are present at the back of the vessel. Though quite large, they were capable of entering a planet's atmosphere and landing, where they towered over the landscape.
Upon their completion, a Prior is required to bring the ship online through an activation ceremony. They are piloted by the Prior himself, who commands a crew of an unknown number of warriors from the Ori army, and is tasked with bringing planets under the banner of Origin.
Ori motherships appear to be smaller than Wraith hive-ships and Ancient city-ships and Aurora-class warships, while Asgard O'Neill-class vessels are roughly equal in size. Ori ships are among the most advanced ships ever encountered by the Tau'ri, easily comparable to the Aurora- and O'Neill-classes in power.
Prometheus was the first, and for a long time only, deep-space battleship built by the Tau'ri. The ship was operated by the U.S. Air Force, and her crew consisted of Air Force personnel. Operationally, Prometheus fell under the purview of the Office of Homeworld Security.
Prometheus used Asgard technology in her hyperdrive engine and shields (There may be other uses of Asgard technology installed). This technology was fitted by the Asgard in return for Earth's help in fighting the Replicators. She also relied on some Goa'uld technology, most notably the ring transporter.
Since the ship's destruction in 2006, Prometheus has remained the sole 303-class ship to be constructed, the planned BC-303 series having been rendered obsolete by BC-304 battlecruiser, an altogether superior vessel.
The Replicator cruiser, also known as the Replicator attack vessel and Replicator mothership, was created by the Human form Replicator Fifth and the design was later used by Replicator Carter. The ship was constructed from Replicator blocks. It had the same basic systems as other ships such as a hyperdrive and shields. It also had the ability to discharge blocks to infest other ships.
There was only one room known to exist which had several different uses. Fifth used it to hold Samantha Carter when he tortured her and later tried to convince her to join him. He also created Replicator Carter in this room. Replicator Carter used it when she captured Daniel Jackson and probed his mind.
Fifth used the ship to escape Halla while the planet was being pulled into a black hole. Once he captured Samantha Carter, Fifth then headed to Orilla. Thor planned to destroy the ship by self-destructing his own, however a Replicator prevented Thor from catching up with it. The Valhalla along with several other O'Neill-class ships were able to destroy it when it emerged from hyperspace.
Fifth later recreated the ship to reach the Milky Way galaxy. He was tricked by Replicator Carter to approach the Alpha Site where he and the ship were destroyed. Replicator Carter recreated the ship when she began her war against the Goa'uld.
Wraith Hive Ship
Wraith hive ships are the main component of the Wraith fleet and the centerpiece of their entire society. Hive Ships function in a role similar to that of Ancient city-ships and Traveler generational ships. A Hive Ship is a massive Wraith mothership capable of carrying unknown thousands of Wraith along with their dart fighters.
Large parts of their internal structure are used to house organic cocoons in which Humans may be stored for later feeding. There are a number of corridors within the large vessel with a fine mist covering the floor. Hive Ships are one of the largest ships known to exist, being roughly thirteen times larger than its main combatant, Earth's 304.
Despite their size, Hive Ships are quite capable of entering a planetís atmosphere and landing. They are even capable of surviving for countless centuries in such conditions to the point where vegetation and the planet's environment can grow around them. This did not affect the ship as it was quite capable of achieving space flight and combat, suffering little, if any, adverse affects.
The Death Glider is a crescent-shaped vessel with wings stylized to look like that of a bird. The wings curve downward, making their tips the lowest point of the vessel. When stored on a Ha'tak, the wings fold in to save space.
The cockpit has room for two people; the front seat is the pilot's chair while the rear position controls the weapons. A single pilot can do both, however. Gliders are piloted by means of a large red sphere. Direct thoughts and spoken words seem to control the craft as long as the pilot touches this device. (SG1: "Into the Fire")
Gliders are capable of both atmospheric and spaceflight. They do not use direct thrust, but rather an interial propulsion system which negates the effect of inertia on the craft. This also allows them to hover. Like most space craft, Death Gliders also possess inertial dampeners which protect the pilot from deadly G-forces.
However, similar to the F-302, they do not appear to function at 100% while traveling at high speeds. Though not designed for it, Death Gliders can be flown underwater. Due to their design, Gliders need a flat surface to land on, or a nearby mothership to dock with.