Ratfor code for the primal-dual log barrier form of the interior point LP solver of Lustig, Marsten and Shanno, ORSA J Opt 1992.

Fortran 77 code by Valentia Ruggiero for large and sparse convex quadratic programs.

Solves nonlinear optimization problems. [Commercial]

Site discusses algorithm and has link to zip file with Fortran 77 code.

Nonlinear programming codes: SQP, least squares, multicriteria optimization, data fitting in ODEs, DAEs, PDEs, PDAEs.

KNITRO, General Nonlinear Programming Solver; L-BFGS, Limited Memory Codes; PREQN, Preconditioning the Conjugate Gradient Method; and CG+, Conjugate Gradient Software.

Codes for network optimization.

Optimization algorithms and software for high-performance computers. The software includes subroutines for the solution of systems of nonlinear equations, nonlinear least squares problems, and minimization problems. Code can be downloaded from ftp://i...

Fortran 77 code by S. P. Uryasev. A similar code is at http://www.ise.ufl.edu/uryasev/varg.txt .

Subspace-searching simplex method for the unconstrained optimization of general multivariate functions, generalizing the Nelder-Mead simplex method.