A subroutines for solving some types of algebraically explicit differential algebraic equations.

A free, portable library for solving nonlinear systems of equations and nonlinear least squares problems.

Stanford Exploration Project library, containing basic seismic data processing routines such as phase shift migration and velocity stacking. Includes documentation, source code, and binary packages for Mac OS X and Cygwin.

Enables Fortran programs to read or write data directly from or into any format that has a Windows Open Database Connectivity (ODBC) driver.

Algorithms for solving large linear systems, optimal control problems, and other topics.

Portable, object-based Fortran interface to the GNU scientific library, a collection of numerical routines for scientific computing. The package is licensed under the GPL.

SciComm serial communications library, SciPlot scientific plotting graphics library, SciSnet sockets network communication library. Compatible with Fortran and C compilers.

Library for writing Windows applications in Fortran.

Multi-platform user interface and graphics subroutine library for Fortran 77/9x developers.

Fortran modules by Arjen Markus to interface with C libraries, manipulate strings, write CSV files, manipulate file and directory names, implement abstract data types and structures, do automatic differentiation, and perform other tasks.