FEniTop vs nTop

FEniTop is free, open-source software for topology optimization based on FEniCSx. It handles two- and three-dimensional problems on structured or unstructured meshes, with varied element geometries, types, orders, and quadrature degrees. Users express partial differential equations in weak form, while automatic differentiation supports finite-element and sensitivity analysis. PETSc through petsc4py provides linear and nonlinear solvers and preconditioners. Parallel implementations of Optimality Criteria and Method of Moving Asymptotes update design variables. A Helmholtz-type PDE filter targets large-scale parallel problems, including large filter radii. FEniTop can run from laptops to distributed computing clusters. Optimized designs export as XDMF files for ParaView post-processing. Repository examples cover beams in 2D and 3D, a 2D disk, a 3D shell, and a 2D compliant mechanism. The software is licensed under GPL-3.0. Setup instructions specify FEniCSx 0.7.3, PyVista, and Xvfb; Windows 11 instructions use Ubuntu under WSL and Docker Desktop.

nTop is an engineering design platform for generating parametric geometry and exploring design variants. Its implicit modeling represents geometry mathematically, helping models remain stable through substantial parameter changes. Design logic can run across thousands of variants on desktop or distributed cloud compute, while GPU compute and machine learning are described as ways to shorten simulation feedback cycles. The platform supports assembly and surface modeling and imports CAD, mesh, CAE, and other formats, including STEP, Parasolid, CATIA V5, Creo, SolidWorks, STL, OBJ, Abaqus, and ANSYS; listed exports include STEP, Parasolid, STL, and 3MF. The interactive desktop application supports 64-bit Windows 11 Enterprise, Professional, and Education editions; nTop Automate also supports Red Hat Enterprise Linux 8.9. The system requirements specify at least 64 GB RAM and an NVIDIA GPU with Volta architecture or newer and 8 GB VRAM. Commercial pricing is on request. Students, educators, and academic researchers can apply for a free non-commercial education version.