DownloadBuild, Design and Test your network in a risk-free virtual environment and access the largest networking community to help. Whether you are studying for your first networking exam or building out a state-wide telecommunications network, GNS3 offers an easy way to design and build networks of any size without the need for hardware.
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License
GNU General Public License version 3.0 (GPLv3)
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User Reviews
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A superb tool for network engineers. Invaluable for study and proof of concept work. And it's free & open source. What more could you ask for?
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just brilliant
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Very good.
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The best network simulator; you can integrate anything into it.
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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