Stars
A Free and Open Source Python Library for Multiobjective Optimization
XbimGeometry contains the CLR interop libraries and the c++ engine used to compute the 3D geometry of models.
Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.
CalculiX examples by Prof. Martin Kraska from Brandenburg University of Applied Sciences. Excellent starting point to master parametric modelling with CGX and CCX.