Top Welcoming Open-Source Fortran Repositories

OpenRadioss is a powerful, industry-proven finite element solver for dynamic event analysis

Fire Dynamics Simulator

CEA computes the equilibrium composition of mixtures via free-energy minimization, and uses the resulting product concentrations to determine thermodynamic and transport properties. It includes a large database of species with thermodynamic curve-fit data, and can be used for rocket performance, detonation parameters, and shock-wave analysis.

Main repository for the NREL-supported OpenFAST whole-turbine and FAST.Farm wind farm simulation codes.

USGS Modular Hydrologic Model

Official git repository of Elmer FEM software

Exascale multiphase flow solver — 2025 Gordon Bell Prize Finalist | 200T grid points on 43K+ GPUs

Quantum chemistry and solid state physics software package

LAPACK development repository

Phantom Smoothed Particle Hydrodynamics and Magnetohydrodynamics code

M.I.T General Circulation Model master code and documentation repository

AOMP is an open source Clang/LLVM based compiler with added support for the OpenMP® API on Radeon™ GPUs. Use this repository for releases, issues, documentation, packaging, and examples.

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Energy Exascale Earth System Model source code. NOTE: use "maint" branches for your work. Head of master is not validated.

Modules for Experiments in Stellar Astrophysics

Collection of builder repositories for BinaryBuilder.jl

Light-weight tight-binding framework

UFS Weather Model

Open Calphad, thermodynamic calculation code

Code for Anisotropies in the Microwave Background

GEOS-Chem "Science Codebase" repository. Contains GEOS-Chem science routines, run directory generation scripts, and interface code. This repository is used as a submodule within the GCClassic and GCHP wrappers, as well as in other modeling contexts (external ESMs).

This repository contains the source files of CalculiX, a three-dimensional Finite Element Program (www.calculix.de).

Düsseldorf Advanced Material Simulation Kit (Read-only mirror)

A library of modern Fortran modules for nonlinear optimization

The Temperature Dependent Effective Potentials (TDEP) code

Fortran Package Manager (fpm)

Semiempirical Extended Tight-Binding Program Package

our classic

A parallel framework for deep learning

trying to collect all useful tutorials for famous C math and linear algebra libraries such as CBLAS, CLAPACK, GSL...

Functional programming for modern Fortran

DFTB+ general package for performing fast atomistic simulations

Fortran 2018 standard examples with broad applications

PRIMA is a package for solving general nonlinear optimization problems without using derivatives. It provides the reference implementation for Powell's derivative-free optimization methods, i.e., COBYLA, UOBYQA, NEWUOA, BOBYQA, and LINCOA. PRIMA means Reference Implementation for Powell's methods with Modernization and Amelioration, P for Powell.

libAtoms/QUIP molecular dynamics framework: https://libatoms.github.io

Fluidity

A Modern Fortran JSON API

Packmol - Initial configurations for molecular dynamics simulations

A data-driven method combining symbolic regression and compressed sensing for accurate & interpretable models.

Code for U.S. EPA’s Community Multiscale Air Quality Model (CMAQ) for estimating ozone, particulates, toxics, and deposition of acids and nutrients at neighborhood to global scales.

Unstructured Compressible Navier Stokes 3D code (UCNS3D)

Collection of Fortran77 subroutines designed to solve large scale eigenvalue problems.

Community Terrestrial Systems Model (includes the Community Land Model of CESM)

CREST - A program for the automated exploration of low-energy molecular chemical space.

Fortran and Python examples to accompany the book "Computer Simulation of Liquids" by Michael P. Allen and Dominic J. Tildesley (2nd edition, Oxford University Press, 2017). Use the "Code" button, or follow the "Releases" link below.

WAVEWATCH III

WannierTools: An open-source software package for novel topological materials. Full documentation:

Official repository of the Wannier90 code

ADflow is a finite volume RANS solver tailored for gradient-based aerodynamic design optimization.