HArDCore: HArDCore (Hybrid Arbitrary Degree::Core) is a set of two projects providing C++ libraries to implement 2D and 3D schemes, on general polytopal meshes, with main unknowns being polynomials in the mesh elements, on the mesh faces and on the mesh edges (hybrid methods). The library was designed with the Hybrid High-Order method in mind (see the book https://hal.archives-ouvertes.fr/hal-02151813), and several HHO methods are already implemented in this framework, but the tools provided in this library are useful for a range of numerical methods. This page is merely a landing page to redirect you to the 2D or 3D codes: HArDCore2D, HArDCore3D