Eurosim
- Federation of European Simulation Societies, a forum for regional and national simulation societies to promote the advancement of modelling and simulation in industry, research and development.
- http://www.eurosim.info/

Mathematical Programming Society
- An international organization dedicated to the promotion and the maintenance of high professional standards in the subject of mathematical programming. It publishes the journals Mathematical Programming A and B, consisting of technical articles on all as
- http://www.mathprog.org/

Decision Sciences Institute
- Aids communication between decision science practioners
- http://www.decisionsciences.org

Deepa & Sanal's Home
- Some articles and links on Futures Studies, Systems Thinking and Operations Research.
- http://www.sanalnair.org

The OR Society
- Provides training, conferences, publications and information to those working in Operational Research. Features study groups, regional societies, training, publications, conferences and news.
- http://www.theorsociety.com/

International Society of Parametric Analysts (ISPA)
- Promotes parametric cost modeling techniques and methodologies and the related fields of risk analysis, econometrics, design-to-cost, technology forecasting, and management.
- http://www.ispa-cost.org/

INFORMS Transactions on Education (ITE)
- ITE is a refereed electronic journal on management science and operations research (MS/OR) education.
- http://ite.informs.org/

Stochastic Programming E-Print Series
- Requires subscription.
- http://dochost.rz.hu-berlin.de/speps/

IIE
- The Institute of Industrial Engineers.
- http://www.iienet.org/

IFORS
- International Federation Of Operational Research Societies
- http://www.ifors.org/

RAND Corporation
- A nonprofit institution that helps improve policy and decisionmaking through research analysis.
- http://www.rand.org/

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.
- http://iridia.ulb.ac.be/~mdorigo/ACO/about.html

Metaheuristics Network
- To improve the understanding of how metaheuristics work.
- http://www.metaheuristics.net/

AMORE
- Algorithmic Methods for Optimizing the Railways in Europe. An EU Research Training Network with participating research groups from Denmark, Germany, Greece, Italy, The Netherlands, and Switzerland.
- http://www.inf.uni-konstanz.de/algo/amore

Optimization Software Guide
- A NEOS guide.
- http://www-fp.mcs.anl.gov/otc/Guide/SoftwareGuide/

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.
- http://www.informs.org/

EURO - Home Page
- The Association of European Operational Research Societies
- http://www.euro-online.org/