Mon Calamari
MC80 Star Cruiser

Originally built as pleasure cruisers by Mon Calamari shipyards, the MC80 Star Cruisers were refitted as warships during the Galactic Civil War. They provided the Rebel Alliance with their first consistent source of large, powerful capital warships.

External resource: Wookieepedia

Known Examples:

Ashleigh: Rogue Squadron - Destroyed
Refitted for use by a human crew. Assigned as Rogue Squadron's flagship from its inception, until its destruction in 50:9.