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.
Get ns-3:
Most recent stable release:
•  Download ns-3.25 code
•  View documentation
Other releases and docs:
•  All releases
•  All documentation

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Get involved:
ns-3 Annual Meeting
•  13-17 June 2016, Seattle
•  Event site
•  Register here
•  Meeting flyer
Current development:
•  ns-3.26 release

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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.