ASA047 is a FORTRAN90 library which seeks to minimize a scalar function of several variables using the Nelder-Mead algorithm, by R ONeill.
ASA047 is Applied Statistics Algorithm 47.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
ASA047 is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version and a Python version.
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PRAXIS, a FORTRAN90 routine which minimizes a scalar function of several variables.
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TEST_OPTIMIZATION, a FORTRAN90 library which defines test problems for the minimization of a scalar function of several variables, as described by Molga and Smutnicki.
TOMS178, a FORTRAN77 library which optimizes a scalar functional of multiple variables using the Hooke-Jeeves method.
TOMS611, a FORTRAN77 library which solves problems in unconstrained minimization.
Original FORTRAN77 version by R ONeill; FORTRAN90 version by John Burkardt.
You can go up one level to the FORTRAN90 source codes.