GNS-3 0.1-alpha

GNS-3 is a graphical network simulator GNS-3 is a graphical network simulator which allows you to design and create complex network topologies. You may run simulations, or configure each device, from a simple workstation to a powerful Cisco router.
To allows complete simulations, GNS-3 is based on two existing projects:
NS-3 , a discrete-event network simulator for Internet systems, targeted primarily for research and educational use.
Dynamips, an IOS emulator which allows users to run IOS binary images from Cisco Systems.
GNS-3 is an open source product that may be used on multiple platforms, including Windows, Linux, and MacOS X.
Main features:
- Design of high quality network topologies.
- Emulation of Cisco routers.
- Load-balancing on multiple hosts/hypervisors when in emulation mode.
- Topology import and export.
- Image exports (PNG, JPEG, BMP, XPM).
System requirements:
- Qt >= 4.2
- Python >= 2.4
- Sip >= 4.5 if you need to compile PyQt
- PyQt >= 4.1