Going to start a link collection of parametric 3D models that use OpenSCAD. Too many good things out there are unfortunately using Fusion3D, which is not really an open alternative, IMHO. But some real gems exist in the OpenSCAD world. This parametric #gridfinity collection for example, that you can customise simply in your browser with an account at Makerworld. Or on your own machine with OpenSCAD.

makerworld.com/en/models/48116…

Gridfinity Extended - Official by ostat

Gridfinity Extended aims to be the most comprehensive OpenSCAD implementation of Gridfinity. It is opensource and maintained by myself on GitHub here ostat/gridfinity_openscad. This scrips are actively maintained, and have regular improvements.

^{makerworld.com}