Imperial Ships

Super Star Destroyer
Kuat Drive Yards Executor-class command ship
Scale: capital
Length: 8000m (subject to a continuity dispute, more probably 17.6km)
Crew: Skeleton: 50000 with command 7D; Total crew: 280734
Passengers: 38000 troops
Cargo Capacity: 250000 metric tons
Consumables: 6 years
Weapons:
250 Turbolaser Batteries
250 Heavy Turbolaser Batteries
250 Concussion Missile Tubes
250 Ion Cannons
40 Tractor Beam Emplacements

Imperator I
Manufacturer: Kuat Drive Yards
Designation: Capital Starship
Length: 1,600 meters
Crew: 37,085
Troops: 9,700
Cargo Capacity: 36,000 metric tons
Consumables: 6 years
Speed: 10 MGLT
Hull: 2,272 RU
Shields: 4,800 SBD
Weapons: 60 Turbolaser Batteries, 60 Ion Cannons and 10 Tractor Beam Projectors.Onboard Craft: 72 TIE Series Fighters, 5 Alpha Class XG-1 Star Wings, 15 Delta Class Dx-9 or Dx-9s Transports , 8 Lambda Class T-4a Shuttles, 1 Gamma Class Assault Shuttle and 1 TIE Shuttle Craft.

Model: Imperator II Class Star Destroyer
Manufacturer: Kuat Drive Yards
Designation: Capital Starship
Length: 1,600 meters
Crew: 37,085
Troops: 9,700
Cargo Capacity: 36,000 metric tons
Consumables: 6 years
Speed: 10 MGLT
Hull: 2,272 RU
Shields: 5,760 SBD
Weapons: 50 Heavy Turbolaser Batteries, 50 Heavy Turbolaser Cannons, 20 Ion Cannons and 10 Tractor Beam Projectors.
Onboard Craft: 72 TIE Series Fighters, 5 Alpha Class XG-1 Star Wings, 15 Delta Class Dx-9 or Dx-9s Transports , 8 Lambda Class T-4a Shuttles, 1 Gamma Class Assault Shuttle and 1 TIE Shuttle Craft.

Rebel Ships

Calamari Cruiser
Manufacturer: MC80a Mon Calamari Capital Starship
Length: 1200 meter
Speed: 40MGLT
Crew: 5,402 (668 officers, 4734 enlisted)
Weapons: 48 Taim & Bak XV9 turbolasers, 20 ArMek SW-7 ion batteries
Shields/Armor: Titanium reinforced hull
Special Features: Two X-Wing, Three Y-Wing, One A-Wing starfighter squadrons

note: There are plenty more Captial ships in Xwing Alliance alot of enemies and some friends