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Publisher · Open source

GNS3

GNS3 Technologies develops GNS3, a network emulation and simulation tool used to build and test virtual network topologies. GNS3 is free open-source software under the GNU General Public License version 3; vendor device images must be supplied by the user under the vendor's own licence.

Licensing at a Glance

  • Open source

  1. The GNS3 Windows installer states that GNS3 is free open source software distributed under the GNU General Public License Version 3.[1]

  2. GNS3 source files are licensed under the GNU General Public License, version 3 or (at the user's option) any later version.[2]

  3. The all-in-one installer is downloaded from gns3.com after creating or logging in to a GNS3 account.[3]

  4. Due to legal requirements GNS3 does not provide Cisco IOS or other Cisco images; users must supply their own, for example downloaded from Cisco, which requires a service contract, or obtained through a VIRL licence.[4]

  5. The Windows installer offers optional third-party SolarWinds tools, such as Solar-PuTTY, which have their own licence agreements and registration requirements.[5]

Products

References

  1. GNS3 Windows Install | GNS3 Documentation · docs.gns3.com · retrieved 2026-09-27
  2. gns3-gui LICENSE · github.com · retrieved 2026-09-27
  3. GNS3 Windows Install | GNS3 Documentation · docs.gns3.com · retrieved 2026-09-27
  4. Where do I get IOS images? | GNS3 Documentation · docs.gns3.com · retrieved 2026-09-27
  5. GNS3 Windows Install | GNS3 Documentation · docs.gns3.com · retrieved 2026-09-27
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