brent_test, a FORTRAN77 code which calls brent(), which contains algorithms for finding zeros or minima of a scalar function of a scalar variable, by Richard Brent.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
brent, a FORTRAN77 library which contains routines for finding zeroes or minima of a scalar function of a scalar variable, without the use of derivative information, including a reverse communication (RC) option, by Richard Brent.