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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.
Get ns-3:
Most recent stable release:
•  Download ns-3.21 code
•  View documentation

Other releases and docs:

•  All releases
•  All documentation

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Get involved:
Workshop on ns-3
•  13 May 2015, Barcelona
•  Call for papers

Help to improve ns-3:
•  Join our mailing lists
•  Help to prepare ns-3.22

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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.