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Melbourne, Australia, The "Open Source" Gridbus Project led by the Grid Computing and Distributed Systems (GRIDS) Laboratory at the University of Melbourne, Australia, is pleased release the next-version of Grid simulation software, the GridSim 2.1 toolkit. The new version of GridSim has been substantially improved. They include: * provides comprehensive GridSim, GridBroker and VisualModeler API * resolves identified bugs * incorporates examples of how to use GridSim and GridBroker * groups the relevant Class files into jar files. Hence, the user only need to include relevant jar file * uses Java's code convention. As a result, increase code readability. All components developed as part of the GridSim Toolkit are released as "open source" under the GPL license to encourage innovation and pass full freedom to our users. The early version of our GridSim toolkit has been used/dowloaded by several academic and commercial organizations around the world, including: California Institute of Technology, Argonne National Lab, University of Illinois at Urbana-Champaign, Manchester University, CERN (European Organization for Nuclear Research), National University of Singapore, Tsinghua University, Sun Microsystems, IBM, Unisys, HP, British Telecom, and EMC Corporation. The GridSim software has been used for modeling and simulating many interesting systems. For example, one of the users from Unisys said that they are exploring its use in data centre modeling. Our own usages include simulating economic Grid scheduler in a competitive economy model; economic based cluster scheduler. The contributors to the GridSim software (early/new version) are: GridSim base platform also broker: Rajkumar Buyya, GRIDS Lab @ University of Melbourne Manzur Murshed, GSCIT @ Monash University Anthony Sulistio, GRIDS Lab @ The U. of Melbourne. GridSim visual modeller by: Anthony Sulistio, GRIDS Lab @ The U. of Melbourne. Chee Shin Yeo, GRIDS Lab @ The U. of Melbourne. To download the GridSim software, please visit the Gridbus Project website: http://www.gridbus.org/gridsim/ The GridSim 2.1 Toolkit Release notes can be found at: http://www.gridbus.org/gridsim/gridsim2.1/ We hope that the users of GridSim will find this new version useful. If you need any specific clarification on the Gridbus Project or the GridSim Toolkit, please contact the developers.