The kernel (Parasolid) is closed source as well as many of the back end bits of Onshape, but all the code behind the standard features that is written in Featur

The kernel (Parasolid) is closed source as well as many of the back end bits of Onshape, but all the code behind the standard features that is written in FeatureScript is under an MIT license (the Onshape Standard Library). https://cad.onshape.com/FsDoc/index.html https://cad.onshape.com/FsDoc/index.html