Fortran Source Code

StatLib

A collection of statistical software including Fortran and C source code.

Alan Miller Fortran Software

Large collection of Fortran source code.

Fortran 90 Software Repository

Lots of Fortran 90 source code.

Netlib

Netlib is a collection of mathematical software, papers, and databases

Department of Biomathematics and Biostatistics Free Code Archive

Biomathematics archive of free source code including Fortran

Some examples of Fortran 90

Two examples of Fortan 90 - find the area of a triangle which demonstrates free-form input, user-defined types and declaration of intent for function arguments and a merge sort of an integer array.