The Cravic were race of beings who used to exist in the Delta Quadrant. They were at war with the Pralor, and both sides built automative units to aid in their war. When the two races called a truce, they tried to dismantle their now-surplus units. However, the units terminated their builders to ensure their survival, and continued the war.
In 2372, the crew of the USS Voyager encountered a Cravic vessel manned by Cravic Automated Personnel Units. The technology of the Cravic ship was roughly equal to that of the Pralor, each with more powerful weapons, but slower engines than Voyager. (VOY: "Prototype")