The Remorseless Angel was a star-ship under the control of Vala Mal Doran.
It is unknown when did Vala came upon the possession of this ship. When she visited the planet Charos to recruit several smugglers for a mission, she used the ship Angel which was hidden on the Charos Spaceport to escape from the planet with her team. Grag was allied with Vala but didn't travel with her on the mission to Inferra.
As replied by Vala, the ship possesses heavy weaponry and many countermeasures. As well as having at least two small transport ships called Lifeboats. The ship is also equipped with Asgard transport rings. (SG1: "Vala Mal Doran 1", "Vala Mal Doran 2")