Gravity Generators are used tactically to disable the movement of strike craft, leaving them vulnerable. They can also be used to forcibly pull ships in hyperspace out into normal space. Ships pulled out of hyperspace tend to sustain damage.
The Kushan and Taiidan Empires created Gravity Generators during the Homeworld War. A notable use of this technology was during an ambush in the Galactic Core, where the enemy used them to pull the Mothership Fleet from hyperspace. However, the nature of the generator made them unable to recharge and if a generator ran out of charge, it would simply explode.