Unconstrained Optimization Software

ASA - adaptive simulated annealing.
BTN - block truncated Newton.
GAUSS - matrix programming language.
LANCELOT - large-scale problems.
LBFGS - unconstrained minimization.
LOQO - Linear programming, unconstrained and constrained nonlinear optimization.
M1QN3 - unconstrained optimization.
OPTIMA Library - optimization and sensitivity analysis.
OPTMUM - unconstrained optimization in GAUSS language.
PETSc - parallel solution of nonlinear equations and unconstrained minimization problems.
PORT 3 - minimization, least squares, etc.
PROC NLP - various nonlinear optimization capabilities.
TENMIN - unconstrained optimization.
TN/TNBC - minimization.
TNPACK - nonlinear unconstrained minimization.
UNCMIN - unconstrained optimization.
VE08 - nonlinear optimization.
NLopt - nonlinear optimization