CloudSim: A Novel Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services by Rodrigo N. Calheiros1, Rajiv Ranjan1, César A. F. De Rose, and Rajkumar Buyya http://www.gridbus.org/reports/CloudSim-ICPP2009.pdf
GridSim: A Grid Simulation Toolkit for Resource Modelling and Application Scheduling for Parallel and Distributed Computing http://www.gridbus.org/gridsim/