These organisations help bring together researchers using agent-based modelling in academia and industry.
OpenABM is a resources page linked to the Network for Computational Modeling for SocioEcological Science (CoMSES Net).
ACM SIGSIM is a special interest group intent on promoting the use of simulation modelling in various industries.
MASS is the Multi Agent Systems and Simulation Research Group at Leeds University, based at their School of Geography and focussing on social and environmental modelling.
CRESS is the Centre for Research in Social Simulation at the University of Surrey promoting the use of simulation in the social sciences.