INFORMS- The Institute for Operations Research and the Management Sciences - INFORMS represents professionals in the fields of operations research and the management sciences (OR/MS), and in related fields such as information technology.

Decision Sciences Institute - Aids communication between decision science practioners

The MITRE Corporation - A public interest company, in partnership with the government. MITRE combines systems engineering and information technology to develop innovative solutions.

Optimization Software Guide - A NEOS guide.

AMORE - Algorithmic Methods for Optimizing the Railways in Europe. An EU Research Trianing Network with participating research groups from Denmark, Germany, Greece, Italy, The Netherlands, and Switzerland.

Metaheuristics Network - To improve the understanding of how metaheuristics work.

Ant Colony Optimization (ACO) - Studies artificial systems that take inspiration from the behavior of real ant colonies and which are used to solve discrete optimization problems.

RAND Corporation - A nonprofit institution that helps improve policy and decisionmaking through research analysis.

IFORS - International Federation Of Operational Research Societies

IIE - The Institute of Industrial Engineers.

Stochastic Programming E-Print Series - Requires subscription.