Gmsh
GmshGmsh is an open-source
‘3D finite element mesh generator
with a built-in CAD engine and post-processor’.
It includes
geometry,
mesh,
solver and
post-processing modules.
They can be controlled
using a GUI;
using .geo script files;
from the command line;
through an API that is available for
Fortran, C, C++, Python and Julia; or
using the authors’
ONELAB interface through Unix or TCP/IP sockets.
Models are defined in terms of volumes, surfaces, curves and points,
and can include embedded internal model entities.
The geometry module includes a built-in kernel (geo) and
an OpenCASCADE kernel (occ).
Geometric entities can be defined top-down, bottom-up, or both; and
they can be combined into ‘physical groups’.
A set of tutorials is available.
Gmsh is available for download as binaries for Linux, MS Windows and Mac OS X, and also as source code. It is also available through various Linux distributions (e.g., the Debian package manager).
Python users can use
pip install --upgrade gmsh
As of 2026 Jan 10, the latest version is 4.15.0 dated 2025 Oct 26.
Release notes are at https://gitlab.onelab.info/gmsh/gmsh/-/releases.