GitHub describes it as Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.. The repository metadata lists C++ as its primary language. The metadata lists the LGPL-2.1 license. This article stays within the project description and details documented in the GitHub repository README.
A library of Parts for FreeCAD. WARNING - This library is huge. It might take a long time to download and make the addons manager unresponsive for many minutes.