Modular Utility PCB System for breadboarding.
See the following thread where I introduced my personal breadboarding system: https://www.modwiggler.com/forum/viewtopic.php?t=267893
The files provided here are in Kicad format.
The gerber files are available in gerber.zip. They are setup for JLCPCB.
There is a "3D View.png" file in each module's folder, which is a screenshot of the PCB in Kicad's 3D Viewer.