CAD
CAD software for designing parts for 3D printing, laser cutting and CNC.
Fusion 360 is the most used CAD program at the space. It is free with a hobby licence, and it is installed on the CAD computers.
FreeCAD is open source, though perhaps not the first choice for beginners. FreeCAD tutorial for 3D printing
There are many other free CAD programs (overview). Read the terms of use carefully, especially if you are working on an invention.