NextHop Makers of GateD, routing software that runs on a PC http://www.nexthop.com/

GNU Zebra Manages TCP/IP based routing protocols. It supports BGP4 (RFC1771), RIPv1, RIPv2 and OSPFv2. Zebra makes use of OS threads where available. http://www.zebra.org/

Route Servers - The Next Generation http://www.rsng.net/

CIPE An ongoing project to build encrypting IP routers. Software is already available for Linux and released under GPL. http://sites.inka.de/sites/bigred/devel/cipe.html

Unofficial GNU Zebra FAQ GNU Zebra documentation, not included into releases, but useful and up-to-date. General dynamic routing info included. http://pilot.org.ua/zebra

Ultr@VNC Combines features from other projects, like video hook driver, Filetransfer, chat and MS Logon support. http://ultravnc.sourceforge.net/