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, Pemu/Qemu and Dynagen.
Go to GNS3.com for last releases.
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The best network simulator; you can integrate anything into it.
Dear groddess, please check out the new GNS3 v1 and on. It's so much better on teh CPU. Old GNS3 was great and all, but 1.x is basically life altering. ^_^ Free download is always availabe at GNS3 dot com. :D