Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE. This is a clone of the official repository located on https://dev.opencascade.org/. Please use official development portal for registering issues and providing patches.
The only thing coming to mind is https://dev.opencascade.org/ - it was the original kernel of the ipad app shapr3d.
This is the official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.
If you're just interested in it as a hobby-level project then OpenCASCADE is about as good as you can get for free as far as a solid modeling kernel goes. All of the commercial solid modeling kernels (ParaSolid, ACIS, etc.) are quite expensive last time I checked, and even then you're still left building a lot of the basic application infrastructure yourself. I would suggest building on top of FreeCAD (which itself is built on top of OpenCASCADE) as a plugin so that most of that application infrastructure work is largely taken care of for you.
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Simple yet powerful CAD (Computer Aided Design) library, written with Python.
I know a software that does some of this stuff written in Python, it's pretty powerfull but it does not cover everything you need. It's on github https://github.com/jimy-byerley/pymadcad
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