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ns-3 - a discrete-event network simulator for internet systems
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
FlexSim - Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.
NetSim - NetSim software was created to simulate various Cisco systems. Cisco software is known around the world as being one of the best network, routing and switch systems for businesses and private use. Read more about NetSim.
VNX - VNX is a simple, fast, and highly effective virtualization tool developed to assist you in creating virtual network testbeds automatically, resulting in time-saving.
Cloonix - Cloonix is an open-source virtual network creation framework based on KVM licensed under the AGPLv3 license.