1

Reference-LAPACK/lapack LAPACK development repository

★ 1.9K ⑂ 509 Fortran

2

wrf-model/WRF The official repository for the Weather Research and Forecasting (WRF) model

★ 1.7K ⑂ 864 Fortran

3

ElmerCSC/elmerfem Official git repository of Elmer FEM software

★ 1.6K ⑂ 389 Fortran

4

fortran-lang/stdlib Fortran Standard Library

★ 1.3K ⑂ 225 Fortran

5

cp2k/cp2k Quantum chemistry and solid state physics software package

★ 1.2K ⑂ 490 Fortran

6

fortran-lang/fpm Fortran Package Manager (fpm)

★ 1.1K ⑂ 136 Fortran

7

OpenFAST/openfast Main repository for the NREL-supported OpenFAST whole-turbine and FAST.Farm wind farm simulation co…

★ 936 ⑂ 530 Fortran

8

pymc-devs/pymc2 THIS IS THE **OLD** PYMC PROJECT (VERSION 2). PLEASE USE PYMC INSTEAD:

★ 877 ⑂ 225 Fortran

9

firemodels/fds Fire Dynamics Simulator

★ 853 ⑂ 687 Fortran

10

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

★ 839 ⑂ 386 Fortran

11

grimme-lab/xtb Semiempirical Extended Tight-Binding Program Package

★ 819 ⑂ 199 Fortran

12

mapmeld/fortran-machine Finally a Fortran MVC web platform

★ 811 ⑂ 43 Fortran

13

QEF/q-e Mirror of the Quantum ESPRESSO repository. Please do not post Issues or pull requests here. Use git…

★ 678 ⑂ 323 Fortran

14

fommil/netlib-java :rocket: High Performance Linear Algebra (low level)

★ 666 ⑂ 127 Fortran

15

nwchemgit/nwchem NWChem: Open Source High-Performance Computational Chemistry

★ 614 ⑂ 188 Fortran

16

nasa/NASTRAN-95

★ 582 ⑂ 252 Fortran

17

SPECFEM/specfem3d SPECFEM3D Cartesian simulates acoustic (fluid), elastic (solid), coupled acoustic/elastic, or poroe…

★ 509 ⑂ 257 Fortran

18

Nek5000/Nek5000 our classic

★ 478 ⑂ 267 Fortran

19

modern-fortran/neural-fortran A parallel framework for deep learning

★ 469 ⑂ 108 Fortran

20

Foadsf/Cmathtuts trying to collect all useful tutorials for famous C math and linear algebra libraries such as CBLAS…

★ 440 ⑂ 48 Fortran

21

wavebitscientific/functional-fortran Functional programming for modern Fortran

★ 437 ⑂ 40 Fortran

22

E3SM-Project/E3SM Energy Exascale Earth System Model source code. NOTE: use "maint" branches for your work. Head o…

★ 434 ⑂ 473 Fortran

23

dftbplus/dftbplus DFTB+ general package for performing fast atomistic simulations

★ 432 ⑂ 194 Fortran

24

scivision/fortran2018-examples Fortran 2018 standard examples with broad applications

★ 414 ⑂ 71 Fortran

25

libprima/prima PRIMA is a package for solving general nonlinear optimization problems without using derivatives. I…

★ 406 ⑂ 55 Fortran

26

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

★ 403 ⑂ 292 Fortran

27

JuliaPackaging/Yggdrasil Collection of builder repositories for BinaryBuilder.jl

★ 401 ⑂ 739 Fortran

28

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

★ 398 ⑂ 130 Fortran

29

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

★ 388 ⑂ 155 Fortran

30

FluidityProject/fluidity Fluidity

★ 385 ⑂ 119 Fortran

31

jacobwilliams/json-fortran A Modern Fortran JSON API

★ 378 ⑂ 96 Fortran

32

rouyang2017/SISSO A data-driven method combining symbolic regression and compressed sensing for accurate & interpreta…

★ 368 ⑂ 95 Fortran

33

m3g/packmol Packmol - Initial configurations for molecular dynamics simulations

★ 363 ⑂ 61 Fortran

34

MODFLOW-ORG/modflow6 USGS Modular Hydrologic Model

★ 362 ⑂ 162 Fortran

35

USEPA/CMAQ Code for U.S. EPA’s Community Multiscale Air Quality Model (CMAQ) for estimating ozone, particulate…

★ 361 ⑂ 229 Fortran

36

ucns3d-team/UCNS3D Unstructured Compressible Navier Stokes 3D code (UCNS3D)

★ 356 ⑂ 108 Fortran

37

ESCOMP/CTSM Community Terrestrial Systems Model (includes the Community Land Model of CESM)

★ 353 ⑂ 361 Fortran

38

opencollab/arpack-ng Collection of Fortran77 subroutines designed to solve large scale eigenvalue problems.

★ 350 ⑂ 136 Fortran

39

Allen-Tildesley/examples Fortran and Python examples to accompany the book "Computer Simulation of Liquids" by Michael P. Al…

★ 345 ⑂ 106 Fortran

40

NOAA-EMC/WW3 WAVEWATCH III

★ 343 ⑂ 668 Fortran

41

nasa/CFL3D

★ 341 ⑂ 194 Fortran

42

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

★ 337 ⑂ 67 Fortran

43

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

★ 334 ⑂ 158 Fortran

44

wannier-developers/wannier90 Official repository of the Wannier90 code

★ 331 ⑂ 177 Fortran

45

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

★ 323 ⑂ 121 Fortran

46

astrofrog/fortranlib Collection of personal scientific routines in Fortran :book:

★ 319 ⑂ 74 Fortran

47

MPAS-Dev/MPAS-Model Repository for MPAS models and shared framework releases.

★ 310 ⑂ 409 Fortran

48

cdslaborg/paramonte ParaMonte: Parallel Monte Carlo and Machine Learning Library for Python, MATLAB, Fortran, C++, C.

★ 307 ⑂ 36 Fortran

49

TarletonGroup/CrystalPlasticity CP UMAT and CZM UEL for Abaqus

★ 306 ⑂ 103 Fortran

50

ct6502/wavelets Torrence & Compo Wavelet Analysis Software

★ 302 ⑂ 170 Fortran

51

vmagnin/gtk-fortran A GTK / Fortran binding, and its documentation (in the Wiki tab).

★ 289 ⑂ 46 Fortran

52

flexi-framework/flexi FLEXI: A high order discontinuous Galerkin framework for hyperbolic–parabolic conservation laws

★ 285 ⑂ 73 Fortran

53

spacepy/spacepy Space Science library for Python - contains superposed epoch classes, drift shell tracing, access t…

★ 273 ⑂ 80 Fortran

54

CaNS-World/CaNS A code for fast, massively-parallel direct numerical simulations (DNS) of canonical flows

★ 271 ⑂ 91 Fortran

55

Unidata/netcdf-fortran Official GitHub repository for netCDF-Fortran libraries, which depend on the netCDF C library. Ins…

★ 269 ⑂ 105 Fortran

56

sourceryinstitute/OpenCoarrays A parallel application binary interface for Fortran 2018 compilers.

★ 268 ⑂ 57 Fortran

57

abinit/abinit The official github mirror of the Abinit repository. We welcome bug fixes and improvements. Note th…

★ 266 ⑂ 106 Fortran

58

wrf-model/WPS The official repository for the WRF Preprocessing System (WPS)

★ 263 ⑂ 195 Fortran

59

NCAR/DART Data Assimilation Research Testbed

★ 259 ⑂ 182 Fortran

60

flame/libflame High-performance object-based library for DLA computations

★ 254 ⑂ 92 Fortran

61

cmbant/CAMB Code for Anisotropies in the Microwave Background

★ 253 ⑂ 192 Fortran

62

pierrehirel/atomsk Atomsk: A Tool For Manipulating And Converting Atomic Data Files -

★ 251 ⑂ 83 Fortran

63

epochpic/epoch Particle-in-cell code for plasma physics simulations

★ 251 ⑂ 76 Fortran

64

ROCm/aomp AOMP is an open source Clang/LLVM based compiler with added support for the OpenMP® API on Radeon™ …

★ 246 ⑂ 60 Fortran

65

MESAHub/mesa Modules for Experiments in Stellar Astrophysics

★ 244 ⑂ 79 Fortran

66

ylikx/forpy Forpy - use Python from Fortran

★ 242 ⑂ 51 Fortran

67

NCAR/wrf_hydro_nwm_public WRF-Hydro model code

★ 242 ⑂ 156 Fortran

68

jgomezc1/ABAQUS-US A variety of ABAQUS user element (UELs) and user material (UMATs) subroutines

★ 241 ⑂ 97 Fortran

69

pencil-code/pencil-code A high-order finite-difference code for compressible hydrodynamic flows with magnetic fields and pa…

★ 240 ⑂ 107 Fortran

70

ExtremeFLOW/neko /ᐠ. ｡.ᐟ\ᵐᵉᵒʷˎˊ˗

★ 238 ⑂ 51 Fortran

71

sundmanbo/opencalphad Open Calphad, thermodynamic calculation code

★ 238 ⑂ 86 Fortran

72

geoschem/geos-chem GEOS-Chem "Science Codebase" repository. Contains GEOS-Chem science routines, run directory genera…

★ 235 ⑂ 196 Fortran

73

dftd4/dftd4 Generally Applicable Atomic-Charge Dependent London Dispersion Correction

★ 227 ⑂ 62 Fortran

74

certik/fortran-utils Various utilities for Fortran programs

★ 226 ⑂ 71 Fortran

75

DSSAT/dssat-csm-os DSSAT Cropping System Model

★ 225 ⑂ 207 Fortran

76

davidrpugh/pyeconomics Computational economics in Python

★ 225 ⑂ 83 Fortran

77

ammarkh95/ABAQUS_PDALAC Development of the Failure Criteria for Composites using ABAQUS Subroutines (UMAT/VUMAT)

★ 224 ⑂ 66 Fortran

78

jacobwilliams/pyplot-fortran For generating plots from Fortran using Python's matplotlib.pyplot 📈

★ 222 ⑂ 55 Fortran

79

mom-ocean/MOM6 Modular Ocean Model

★ 220 ⑂ 285 Fortran

80

xcompact3d/Incompact3d Current CPU version of our solver for the Navier-Stokes equations

★ 212 ⑂ 147 Fortran

81

tblite/tblite Light-weight tight-binding framework

★ 212 ⑂ 67 Fortran

82

xzhang66/MPM3D-F90 MPM3D-F90: An open source code for three dimensional material point method.

★ 212 ⑂ 67 Fortran

83

esmf-org/esmf The Earth System Modeling Framework (ESMF) is a suite of software tools for developing high-perform…

★ 211 ⑂ 90 Fortran

84

jacobwilliams/Fortran-Astrodynamics-Toolkit A Modern Fortran Library for Astrodynamics 🚀

★ 208 ⑂ 59 Fortran

85

SciFortran/SciFortran An open-source Fortran library for mathematics, science and engineering (*in a way* just like scipy…

★ 208 ⑂ 40 Fortran

86

Starlink/starlink Starlink Software Collection

★ 208 ⑂ 70 Fortran

87

davidmorinNTNU/ABAQUS_subroutines A repository of ABAQUS FORTRAN subroutines

★ 207 ⑂ 52 Fortran

88

Goddard-Fortran-Ecosystem/pFUnit Parallel Fortran Unit Testing Framework

★ 204 ⑂ 61 Fortran

89

Cambridge-ICCS/FTorch A library for directly calling PyTorch ML models from Fortran.

★ 201 ⑂ 40 Fortran

90

certik/fastGPT Fast GPT-2 inference written in Fortran

★ 199 ⑂ 23 Fortran

91

brli3/CFD Basic Computational Fluid Dynamics (CFD) schemes implemented in FORTRAN using Finite-Volume and Fin…

★ 198 ⑂ 72 Fortran

92

ufs-community/ufs-weather-model UFS Weather Model

★ 192 ⑂ 282 Fortran

93

Dhondtguido/CalculiX This repository contains the source files of CalculiX, a three-dimensional Finite Element Program (…

★ 192 ⑂ 59 Fortran

94

jacobwilliams/bspline-fortran Multidimensional B-Spline Interpolation of Data on a Regular Grid

★ 188 ⑂ 62 Fortran

95

scientific-computing/FKB A two-way deep learning bridge between Keras and Fortran

★ 188 ⑂ 41 Fortran

96

clawpack/pyclaw PyClaw is a Python-based interface to the algorithms of Clawpack and SharpClaw. It also contains t…

★ 186 ⑂ 107 Fortran

97

openmopac/mopac Molecular Orbital PACkage

★ 183 ⑂ 43 Fortran

98

CliMT/climt The official home of climt, a Python based climate modelling toolkit.

★ 181 ⑂ 48 Fortran

99

camaramm/tennessee-eastman-profBraatz The Fortran 77 codes for the open-loop and the closed-loop simulations for the Tennessee Eastman p…

★ 180 ⑂ 65 Fortran

100

kookma/ogpf ogpf is Object based interface to GnuPlot from Fortran 2003, 2008 and later

★ 177 ⑂ 48 Fortran