Mark Handley writes "XORP is the eXtensible Open Router Platform - an open-source router software stack for FreeBSD and Linux. It's designed from scratch to be extensible, so you can write your own router applications that play nicely with the existing routing protocols. We just released XORP 1.0! There's also a Live CD if you want to try it out without reinstalling your machine. More details in this CNET article."