maybe a gravity and/or atmosphere generator so you can make a moon base without needing a breathing EPP and an asteroid base with an atmosphere and gravity. Also,the anti gravity generator can make a section in your house not have gravity, it'll be great for trolling. They'll have to be crafted at the wiring station of coarse.
Gravity and atmosphere generators are a good idea, but only if they can only be used on the asteroids or moons. There is no need to change those things in a normal planet.