SMMP
- Fortran 77 code for sparse matrix multiplication, transposition, and format conversion.
- http://www.netlib.org/aicm/smmp

OptimQR
- The optimqr program will read a description of the sparsity pattern of some system matrix for system of linear equations. It will then apply heuristic branch & bound search to find a near-optimal ordering of the rows and columns of the system matrix.
- http://unthought.net/OptimQR/

Y12m
- Fortran 77 code that solves sparse systems of linear algebraic equations by Gaussian elimination.
- http://www.netlib.org/y12m/index.html

SVDPACK
- Comprised of four numerical (iterative) methods for computing the singular value decomposition (SVD) of large sparse matrices using double precision Fortran 77.
- http://www.netlib.org/svdpack/

PROPACK
- Software by Rasmus Munk Larsen for large and sparse SVD calculations, with versions in Fortran and Matlab.
- http://sun.stanford.edu/~rmunk/PROPACK/

Block-band Matrix Solver
- By Udo Grabowski.
- http://www-imk.fzk.de:8080/imk2/ame/grabowski/DarkStar/spinoff.html

UMFPACK for sparse linear equations
- Fortran 77 source code for solving sparse asymmetric linear equations, including a version for complex matrices. There are copyright restrictions.
- ftp://ftp.cis.ufl.edu/pub/umfpack

Systems Optimization Laboratory
- Code for sparse linear equations (symmetric or general) and sparse least squares, and updating a dense square factorization L C = U.
- http://www.stanford.edu/group/SOL/software.html

SYMMLQ: Sparse Symmetic Equations
- Solves a set of sparse, symmetric linear equations using a conjugate gradient type method.
- http://www.stanford.edu/group/SOL/software/symmlq.html

SPARSKIT
- General purpose Fortran library by Yousef Saad for sparse matrix computations.
- http://www-users.cs.umn.edu/~saad/software/SPARSKIT/sparskit.html

SMLIB
- Fortran 90 modules by Ernst Meese for the compressed sparse row (CSR) and the modified sparse row (MSR) data storage formats, a very general incomplete LU factorisation routine, the Krylov subspace solvers CGS, BiCGSTAB and GMRES.
- ftp://ftp.ntnu.no/pub/smlib/

NSPCG
- Fortran 77 subroutines for solving large sparse linear systems by adaptive accelerated iterative algorithms.
- http://rene.ma.utexas.edu/CNA/NSPCG/

NIST Fortran Sparse BLAS
- Provides computational kernels for fundamental sparse matrix operations.
- http://math.nist.gov/~KRemington/fspblas/

MINRES: Sparse Symmetic Equations
- Solves sparse linear equations using a conjugate-gradient type method.
- http://www.stanford.edu/group/SOL/software/minres.html

ITPACK
- Collection of Fortran 77 subroutines for solving large sparse linear systems by adaptive accelerated iterative algorithms.
- http://rene.ma.utexas.edu/CNA/ITPACK/

BILUM
- Code by Yousef Saad and Jun Zhang to solve general sparse linear systems by using Krylov subspace methods preconditioned by some multi-level block ILU (BILUM) preconditioning techniques.
- http://www.cs.uky.edu/~jzhang/bilum.html