""Insight Maker is a Free web based modeling and simulation environment developed by Scott Fortmann-Roe. Insight Maker was first released in February 2010 and has continued to develop since then There are questions which arise during the development of a Systemic Strategy that simply can not be answered with qualitative models. At times only a dynamic quantitative simulation is capable of providing the level of understanding necessary to answer some questions. This Systems Thinking World Learning Thread provides an in depth introduction to modeling & simulation using Insight Maker, a free, web-based, multi-user modeling & simulation environment."
Via Howard Rheingold