GNS3

GNS3 is a graphical network simulator that allows simulation of complex networks. To provide complete and accurate simulations, GNS3 is strongly linked with: Dynamips, a Cisco IOS emulator.

Free Open Source Mac OS X Windows Linux

Cisco Packet Tracer

Packet Tracer is an essential learning tool used in these Cisco Networking Academy courses: IT Essentials, CCNA Routing and Switching, CCNA Security, Intro to Internet of Things (IoT), and Mobility Fundamentals. .

Free Windows

NetSim

NetSim for CCNP Network Simulator is now updated to support the new ROUTE, SWITCH and TSHOOT technologies.

Commercial Windows

Free SNMP Agent Simulator

Verax SNMP agent simulator allows IT personnel to build virtual, simulated networks of devices without purchasing any additional hardware, for instance for testing...

Freemium Windows Linux

Dynamips

Dynamips is an emulator computer program that was written to emulate Cisco routers.

Free Open Source Mac OS X Windows Linux