1. Research Societies and Communities

INFORMS - Institute for Operations Research and the Management Science (Membership)
- TSL Wiki - The Transportation Science and Logistics Society Wiki
SIAM - Society for Industrial and Applied Mathematics (Membership)
IFORS - Internation Federation of Operations Research Societies
MPS - Mathematical Programming Society
IAFE - The International Association of Financial Engineers
SCE - Society for Computational Economics
JFIG - Junior Faculty Interest Group (INFORMS)
IEEE TCEC - IEEE Technical Committee on Electronic Commerce
ACM SIGecom - ACM: Special Interest Group on Electronic Commerce
IAOR - International Abstracts in Operations Research
CIMERR - Center for Industrial & Management Engineering Research Resources {ko}
KIIE - Korean Institute of Industrial Engineers {ko}
KORMS - Korean Operations Research and Management Scienct Society {ko}
KOSEN - The Global Network of Korean Scientists and Engineers {ko}
EIC - Electonics Information Center {ko}

2. Data Set

A compendium of NP optimization problems
Handbook of Test Problems for Local and Global Optimization
Decision Tree for Optimization Software -- Hans D. Mittelmann. This provide a comprehensive guide for choosing optimization software.
CVX: Matlab Software for Disciplined Convex Programming -- Michael Grant and Stephen Boyd
OpenSolver - The Open Source Solver for Excel
CPLEX Teaching Edition - CPLEX is available for free for academics, but limited to 500 variables and 500 constraints.
IBM ILOG CPLEX Optimization Studio Academic Research Edition - Full version of CPLEX is available for academics. (Faculty members only)
GAMS - GAMS student version is available for free with some limitations.
COIN-OR - Computational Infrastructure for Operations Research
NEOS Server - Server for Optimization
TOMLAB Optimization - For MATLAB®, LabVIEW®, AMPL® and Microsoft .NET Framework®
NAG Toolbox for MATLAB