Global Optimum Limited (software development for businesses efficiency).
Yudoko, a Sudoku puzzle solver and generator (it generates puzzles with unique solutions)
Enginest Software -- Natural Constraint Language
(NCL).
i2 (Supply Chain Management).
ILOG.
LINE (collective transportation, logistics).
MPL (Optimisation Modelling tool).
Koalog
Actenum Corporation (Bill Havens, Morten Irgens, Vancouver)
Constraints Archive
Inter-disciplinary Scheduling Network, UK
Michael Trick's Operations Research Page.
a huge collection of pointers for OR.
Travelling Salesman Library
JPL Planning & Scheduling Research
Estimation of Distribution Algorithms (EDA), Professor Pedro Larraņaga's group at University of the Basque Country, Spain
The Reactive Search Website
Cork Constraint Computation Centre, (4C)
CIRL, University of Oregon.
AI International, UK.
Professor Hao's Constraint & Combinatorial Optimization Group.
Professor Makoto Yokoo (distributed constraint satisfaction).
Java Constraint Kit
Constraint Handling Rules (CHR) by Thom Fruehwirth.
FRODO,
a simulation platform for distributed constraint satisfaction/optimization problems by
Adrian Petcu,
AI Lab,
EPFL, Switzerland