Microsoft спонсирует проект под BSD License:
http://www.xorp.org/
Welcome to XORP
XORP is the eXtensible Open Router Platform.
Our goal is to develop an open source software router platform that is stable
and fully featured enough for production use, and flexible and extensible enough
to enable network research. Currently XORP implements routing protocols for IPv4
and IPv6 and a unified means to configure them. In future, we would also like to
support custom hardware and software forwarding architectures.
XORP is free. It is covered by a BSD-style license and is publicly available
for research, development, and use.
The core team is based at the International Computer Science Institute in
Berkeley, California, but contributors come from around the world.
Acknowledgments
Initial funding to develop XORP is provided by Intel and the National Science
Foundation. Further funding has been provided by Microsoft Corporation. We are
extremely grateful for their support.