There are various Fortran tools and libraries. Some are free and some are paid services.

Following are some free libraries −

• RANDLIB, random number and statistical distribution generators
• BLAS
• EISPACK
• GAMS–NIST Guide to Available Math Software
• Some statistical and other routines from NIST
• LAPACK
• LINPACK
• MINPACK
• MUDPACK
• NCAR Mathematical Library
• The Netlib collection of mathematical software, papers, and databases.
• ODEPACK
• ODERPACK, a set of routines for ranking and ordering.
• Expokit for computing matrix exponentials
• SLATEC
• SPECFUN
• STARPAC
• StatLib statistical library
• TOMS
• Sorting and merging strings

The following libraries are not free −

• The NAG Fortran numerical library
• The Visual Numerics IMSL library
• Numerical Recipes