Supranational OR societies:

• IFORS (International Federation of Operational Research Societies)
  
• EURO (Association of European Operational Research Societies)
  
• INFORMS (Institute for Operations Research and Management Science)
  

Other organizations:

• SSOV - Slovakia
• ÖGOR - Austria
• GOR e.V. - Germany
• HORS - Hungary
• Operational Research Society
  
• International Society on Multiple Criteria Decision Making
  
• International Society for the Theory and Application of Multi-Objective Decision Analysis
  

On-line journals:

• OR/MS Today
  
• ITORMS - Interactive Transactions of OR/MS
  

OR software:

• ALPHATECH
  
• Dash Associates - XPRESS-MP
  
• Visual Thinking - SIMUL8, V.I.S.A
  
• AMPL Modeling Language for Mathematical Programming
  
• Linear Programming Interior Point Solvers
  
• Aimms 3 The Modelling System
  
• Banxia Software
  
• CPLEX Optimization, Inc.
  
• GAMS Home Page
  
• ILOG Optimization Suite
  
• LINDO Systems Home Page - Lindo, Lingo, What's Best
  
• Maximal Software Home Page
  
• TreeAge Software, Inc.