GNS3
GNS3 is a graphical network simulator that allows simulation of complex networks.
Some of the top features or benefits of GNS3 are: Realistic Network Simulation, Wide Device Support, Free and Open-Source, Community Support, and Extensive Learning Resources. You can visit the info page to learn more.
Best GNS3 Alternatives & Competitors in 2025
The best GNS3 alternatives based on verified products, community votes, reviews and other factors.
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Open-Source Alternatives.
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Download Cisco Packet Tracer, an innovative network simulation and visualization tool used by Cisco Networking Academy students and instructors.
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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.
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Managing contracts just got easier with CobbleStone!
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a discrete-event network simulator for internet systems
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Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.
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Mininet is a robust and inexpensive Instant Virtual Network designed to function on standard PCs like Laptops and Desktops.
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Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.
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Verax Systems provides applications covering the entire IT & Telco service lifecycle from definition through provisioning and monitoring up to billing.
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VNX is a simple, fast, and highly effective virtualization tool developed to assist you in creating virtual network testbeds automatically, resulting in time-saving.
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Cloonix is an open-source virtual network creation framework based on KVM licensed under the AGPLv3 license.
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Actran is a finite element-based simulation software to analyze the acoustic behavior of mechanical systems and parts.
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Dynamips is an emulator computer program that was written to emulate Cisco routers.
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The new EVE-NG platform is ready for todays requirements.
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OPNET is a next-gen and highly resourceful network simulator tool that enables engineers and other professionals to simulate the performance and output of any network type.