GNS3 is a graphical network simulator that allows you to design complex network topologies. You may run simulations or configure devices ranging from simple workstations to powerful Cisco routers. It is based on Dynamips, an IOS emulator which allows users to run IOS binary images from Cisco Systems and Pemu, a PIXOS emulator to emulate PIX firewalls. License: GNU General Public License (GPL) Changes: This release adds the ability to load .net files of other users, detailed tooltips for nodes, a wizard when starting new topology, a button to insert a picture on the scene, decorative node support for creating network diagrams and a symbol manager, ghostios for remote hypervisors, automatic load balancing on external hypervisors, and a new option to bind the hypervisor manager with an address/name other than 'localhost'. Z values can be changed for annotations and inserted pictures.

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