JACOBI is a FORTRAN77 library which sets up the Jacobi iteration for linear systems.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
JACOBI is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.
CG_RC, a FORTRAN77 library which implements the conjugate gradient method for solving a positive definite sparse linear system A*x=b, using reverse communication.
MGMRES, a FORTRAN77 library which applies the restarted Generalized Minimum Residual (GMRES) algorithm to solve a sparse linear system, by Lili Ju.
SPARSEKIT, a FORTRAN77 library which implements operations on sparse matrices, including conversion between various formats, by Yousef Saad.
TEMPLATES, a FORTRAN77 library which carries out simple versions of various iterative solvers.
TEST_MAT, a FORTRAN77library which defines test matrices.
You can go up one level to the FORTRAN77 source codes.