GMU's ECLab, Autonomous Robotics Laboratory, and Center for Social Complexity are proud to announce the official released of ECJ version 21 and MASON version 17. They are available here:

http://cs.gmu.edu/~eclab/projects/ecj/
http://cs.gmu.edu/~eclab/projects/mason/

These released have been a long time in coming: between 1 and 2 years. They reflect a significant degree of improvement of both the systems, and the assistance of a significant number of people to whom we are thankful.

ECJ is a high-performance evolutionary computation and stochastic optimization system written in Java. MASON is a high performance ultralight multiagent simulation toolkit intended for "swarm"-style simulations.

Sean Luke