toms666, a FORTRAN77 code which locates and evaluates roots of systems of nonlinear equations, by Michael Vrahatis. This is a version of ACM TOMS algorithm 666.
The original version of toms666 is available through ACM: https://www.acm.org/pubs/calgo or NETLIB: https://www.netlib.org/toms/index.html
The computer code and data files made available on this web page are distributed under the MIT license
toms666 is available in a FORTRAN77 version.
Original Fortran77 version by Michael Vrahatis.