The AA-9 Coruscant freighter, also known as the Botajef Freighter-Liner, was a massive freighter-model used to transport large groups of people to and from Coruscant.
As a result of the dislocation of populations by the Separatist Crisis, the Refugee Relief Movement converted a number of these freighters into makeshift passenger transports, with the middle deck modified to carry 30,000 people.
During the Clone Wars, ships of this kind were used as cargo transports for the Grand Army of the Republic and were often gathered into convoys, with added protection given by dedicated Republic warships. They were also used as troop transports by the Clone Army itself.
The civilian version was known to be in use at least 20 years later, during the Galactic Civil War.
The Gunship Transport was a non-combat unit used by the Galactic Republic to ferry troops and equipment around the battlefield. The transport was capable of spacial and atmospheric flight and was unarmed.