Software Alternatives, Accelerators & Startups

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.
Filter: 4 Open-Source Alternatives. Latest update:

  1. 61

    Download Cisco Packet Tracer, an innovative network simulation and visualization tool used by Cisco Networking Academy students and instructors.

    /cisco-packet-tracer-alternatives
  2. 54

    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.

    /netsim-alternatives
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  4. 39

    a discrete-event network simulator for internet systems

    Open Source

    /ns-3-alternatives
  5. 33

    Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.

    /paessler-multi-server-simulator-alternatives
  6. 31

    Mininet is a robust and inexpensive Instant Virtual Network designed to function on standard PCs like Laptops and Desktops.

    Open Source

    /mininet-alternatives
  7. 29

    Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.

    /flexsim-alternatives
  8. 39

    Verax Systems provides applications covering the entire IT & Telco service lifecycle from definition through provisioning and monitoring up to billing.

    /free-snmp-agent-simulator-alternatives
  9. 26

    VNX is a simple, fast, and highly effective virtualization tool developed to assist you in creating virtual network testbeds automatically, resulting in time-saving.

    /vnx-alternatives
  10. 23

    Cloonix is an open-source virtual network creation framework based on KVM licensed under the AGPLv3 license.

    /cloonix-alternatives
  11. 27

    Actran is a finite element-based simulation software to analyze the acoustic behavior of mechanical systems and parts.

    /actran-alternatives
  12. 34

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

    /dynamips-alternatives
  13. 39

    The new EVE-NG platform is ready for todays requirements.

    /eve-ng-alternatives
  14. 25

    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.

    /opnet-alternatives
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