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ns-3 is a discrete-event network simulator for Internet systems, targeted primarily for research and educational use. ns-3 is free software, licensed under the GNU GPLv2 license, and is publicly available for research, development, and use.
Download latest release:
Most recent stable release
(currently ns-3.21)

Older archived releases:

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Documentation:
Most recent stable release
(currently ns-3.21)

Project documentation:

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Consortium:
Building a great network simulator for research and education requires many contributions from the community. The NS-3 Consortium provides organizational and financial support to the open source project.