CERN Program Library

The CERN Program Library (CERNLIB) is a collection of general purpose software libraries and program modules for scientific computing. The application area of the library focuses on physics research, in particular high energy physics, involving general mathematics, data analysis, detectors simulation, data-handling, numerical analysis, and others, applicable to a wide range of scientific problems. Many modules are written in the FORTRAN 77 language.

For more information, see Wikipedia.