GNS3 for Mac 2.2.6 Sourceforge    

... * Dynamips, the core program that allows Cisco IOS emulation. * Dynagen, a text-based front-end for ... can also be used to experiment features of Cisco IOS, Juniper JunOS or to check configurations that need to be deployed later on real routers. This project is an open source, free ... and complex network topologies. * Emulation of many Cisco IOS router platforms, IPS, PIX and ASA firewalls, .... Free download of GNS3 for Mac 2.2.6

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GNS3 for Linux 0.8.5 Sourceforge    

... * Dynamips, the core program that allows Cisco IOS emulation. * Dynagen, a text-based front-end for ... can also be used to experiment features of Cisco IOS, Juniper JunOS or to check configurations that need to be deployed later on real routers. This project is an open source, free ... and complex network topologies. * Emulation of many Cisco IOS router platforms, IPS, PIX and ASA firewalls, .... Free download of GNS3 for Linux 0.8.5

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