Australasian Chapter of the System Dynamics Society

isee systems (formerly High Performance Systems) are the creators of iThink and Stella simulation modeling software

Publishes the Systems Thinker newsletter, hosts the annual Systems Thinking Conference, and publishes many System Dynamics texts including the seminal books in the field.

Tom Fiddaman's web site  containing an SD model library

The System Dynamics in Education Project (SDEP) was a group of MIT students working under the guidance of Professor Jay W. Forrester from 1990 to 2003.  The primary project of the group was writing the Road Maps series of self-study guides for learning system dynamics.