George Mason University, Università Degli Studi Di Salerno, and The University at Buffalo, are proud to announce the official release of MASON 21 with Distributed MASON 1 https://cs.gmu.edu/~eclab/projects/mason/ and GeoMason 1.7 with Distributed GeoMason 1 https://cs.gmu.edu/~eclab/projects/mason/extensions/geomason/ [Sorry for the long URLS -- GMU irritatingly employs a URL security rewriting thing] MASON is a high performance open-source modeling toolkit in pure Java, designed to be fast, highly hackable and modifiable, and to guarantee repeatable results, among many other capabilities. MASON comes with extensive visualization capabilities and regularly runs on everything from laptops to back-end supercomputers. Distributed MASON is an open-source, massively distributed version of MASON meant for server/farm and cloud computing deployment using a combination of MPI and RMI. It runs MASON over a large number of collective machines. GeoMASON is an open source set of extensions to MASON which add GIS capabilities, including reading and writing standard formats, embodying agents in GIS environments, and visualization. Distributed GeoMASON is an open source set of extensions to GeoMASON to enable it to run over Distributed MASON in both server/farm and cloud computing environments. If you have questions regarding MASON, GeoMason, or their distributed brethren, join the MASON mailing list and ask away! The list is here: https://cs.gmu.edu/~eclab/projects/mason/#mailinglist Sean Luke Carmine Spagnuolo Andrew Crooks Robert Simon Matteo D'Aurio Giuseppe D'Abrosio Daniele Di Vinco Raj Patel Raj Lather Na Jiang Ermo Wei Joonseok Kim Ryan Moffatt Haolian Wang Lilas Dinh [And others I'm sure I've neglected]