FlexSim
AnyLogic
ns-3
Paessler Multi Server Simulator
IMUNES
NetSim
Cisco VIRL
Mininet
Simile
AnyLogic
MATSim
Simulation of Urban MObility (SUMO)
TRANSIMS
JaamSim
TSIS-CORSIM
Simio
FlexSim
SimileAnyLogic - AnyLogic has changed simulation modeling and expanded its application into complex business environments. The unmatched flexibility of multimethod modeling allows users to capture the complexity of virtually any system, at any level of detail.
ns-3 - a discrete-event network simulator for internet systems
MATSim - MATSim is an open-source framework for implementing large-scale agent-based transport simulations.
Paessler Multi Server Simulator - Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.
Simulation of Urban MObility (SUMO) - "Simulation of Urban MObility" (SUMO) is an open source, highly portable, microscopic and continuous road traffic simulation package designed to handle large road networks. SUMO is licensed under the Eclipse Public License V2.
IMUNES - IMUNES is a cost-effective and efficient Integrated Multiprotocol Network Simulator/Emulator that functions as a tool for Linux and FreeBSD.