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Top : Computers : Programming : Languages : Fortran : Source Code : Optimization (21 web sites)
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Science: Math: Combinatorics: Software: Linear_Programming_and_Optimization
Science: Math: Operations_Research
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CirCut
Fortran 90 package for finding approximate solutions of certain binary quadratic programs, currently including the Max-Cut and the Max-Bisection problems.
http://www.caam.rice.edu/~zhang/circut/index.html

Constrained and Unconstrained Testing Environment, revisted (CUTEr)
Testing environment for optimization and linear algebra solvers. The package includes a collection of test problems, along with Fortran 77, Fortran 90/95 and Matlab tools intended to help developers design, compare and improve new and existing solvers.
http://cuter.rl.ac.uk/cuter-www/

DONLP2
Fortran 77 code for general differentiable nonlinear programming using dense linear algebra, by Peter Spellucci.
ftp://ftp.mathematik.tu-darmstadt.de/pub/department/software/opti/DONLP2/

Decision Tree for Optimization Software
Linear and non-linear optimization, constrained and unconstrained. Mainly Fortran 77 but some in C.
http://plato.la.asu.edu/guide.html

Differential Evolution
Fortran 90 code implementing the Differential Evolution method, a simple but powerful population-based, stochastic function minimizer.
http://www.icsi.berkeley.edu/~storn/DE_FORTRAN90.f90

Fortran 95 Codes for Convex Network Optimization
Modules for random number generation, plotting, sorting, ranking, combinatorics, network optimization, and optimization. Written in FWEB by Aleksandar Donev.
http://computation.pa.msu.edu/NO/F90/

Galahad
Thread-safe library of Fortran 90 packages for solving nonlinear optimization problems, covering unconstrained and bound-constrained optimization, quadratic programming, nonlinear programming, systems of nonlinear equations and inequalities, and nonlinear least squares problems.
http://galahad.rl.ac.uk/galahad-www/

Global Optimization
Links to global optimization code, mainly in Fortran 77 and C, but some links to local minimizers as well.
http://www.mat.univie.ac.at/~neum/glopt.html

Ladislav Luksan: Subroutines
Fortran 77 codes for nondifferentiable, large-scale, or dense nonlinear optimization. Mostly under the GNU General Public License.
http://www.uivt.cas.cz/~luksan/subroutines.html

Linear Programming
Ratfor code for the primal-dual log barrier form of the interior point LP solver of Lustig, Marsten and Shanno, ORSA J Opt 1992.
http://www.econ.uiuc.edu/~roger/research/rqn/rqn.b

Minpack
Fortran 77 code for solving nonlinear equations and nonlinear least squares problems. Five algorithmic paths each include a core subroutine and an easy-to-use driver. The algorithms proceed either from an analytic specification of the Jacobian matrix or directly from the problem functions.
http://www.netlib.org/minpack/

Opt
Optimization codes at Netlib.
http://www.netlib.org/opt/

Optimization Software Developed by J. Nocedal's Research Team
KNITRO, General Nonlinear Programming Solver; L-BFGS, Limited Memory Codes; PREQN, Preconditioning the Conjugate Gradient Method; and CG+, Conjugate Gradient Software.
http://www.ece.northwestern.edu/~rwaltz/software.html

Projection-Type Methods for Large Quadratic Programs
Fortran 77 code by Valentia Ruggiero for large and sparse convex quadratic programs.
http://web.unife.it/utenti/valeria.ruggiero/personale/software/

Quadratic Assignment Problem Library (QAPLIB)
By R.E. Burkard, E. Çela, S.E. Karisch and F. Rendl.
http://anjos.mgi.polymtl.ca/qaplib/codes.html

SUBPLEX
Subspace-searching simplex method for the unconstrained optimization of general multivariate functions, generalizing the Nelder-Mead simplex method.
http://www.netlib.org/opt/subplex.tgz

Stanford Business Software
Sells Fortran 77 optimization codes MINOS (linear programming and nonlinear optimization), SNOPT (large-scale quadratic and nonlinear programming), NPSOL (nonlinear programming), LSSOL (Linearly constrained linear least squares problems and convex quadratic programming), and QPOPT (linear and quadratic programming).
http://www.sbsi-sol-optimize.com/

TANGO: Trustable Algorithms for Nonlinear General Optimization
A set of Fortran routines for optimization developed at the University of São Paulo. Includes downloads, test problems, and related publications.
http://www.ime.usp.br/~egbirgin/tango/

TRON
Trust region Newton method for the solution of large bound-constrained optimization problems, by Chih-Jen Lin and Jorge Moré.
http://www-unix.mcs.anl.gov/~more/tron/