This post announces that security restrictions on SES are no longer enforced by the United States government’s Department of Homeland Security or the Federal Transit Administration. You can download the last public version of SES, Version 4.1 from 2003, at http://openses.net/ . The site includes additional documentation and a discussion forum. The installation file includes the source code. Removing these restrictions enables the community to start the open-source development of SES. Chermac Rolle, Tom O’Dwyer, and I hope to engage the industry in our initiative known as “OpenSES”. We plan to finish our private development of OpenSES 4.2 this summer and release the source code as open-source. For the most part, the framework for our development follows the Fire Dynamic Simulator’s model. Subscribe to the Next SES newsletter to get the latest developments. I look forward to making progress as a community. Please subscribe to the Next SES Newsletter at the bottom of http://openses.net/ to follow this effort.