GUI for the Dynamips Cisco router emulator
To manually install GNS3 with Homebrew, use the following command:
Current version of GNS3.app: 3.0.3
ARM: https://github.com/GNS3/gns3-gui/releases/download/v3.0.3/GNS3-3.0.3.dmg
Intel: https://github.com/GNS3/gns3-gui/releases/download/v3.0.3/GNS3-3.0.3.dmg
Website: https://www.gns3.com/