toms467, a Fortran77 code which implements ACM toms algorithm 467, to transpose the elements of a matrix in place.
The text of many ACM TOMS algorithms is available online through ACM: https://www.acm.org/pubs/calgo or NETLIB: https://www.netlib.org/toms/index.html.
The information on this web page is distributed under the MIT license.
toms467 is available in a Fortran77 version.
minpack, a Fortran90 library which contains routines which can minimize the absolute value of a function of several variables.
TEST_OPT, a Fortran90 library which contains routines defining a number of scalar functions of multiple variables to test minimization routines.