ALTQ: Alternate Queuing for BSD UNIX, http://www.csl.sony.co.jp/~kjc/software.html#ALTQ
http://www.kame.net/
http://www.iptables.org
http://www.ipfilter.org
http://www.netfilter.org
http://www.benzedrine.cx/pf.html
http://www.openbsd.org/faq/pf/index.html
http://www.bsdnews.org/0101/policy_routing.php
http://lartc.org/
http://www.policyrouting.org/
http://www.bell-labs.com/project/eclipse/release
http://info.iet.unipi.it/~luigi/ip_dummynet/
RFC 2474, RFC 2475, RFC 3260 (DiffServ)
RFC 2430, "A Provider Architecture for Differentiated Services and Traffic Engineering (PASTE)" (MPLS+RSVP)
IP Quality of Service, by Srinivas Vegesna (Cisco Press, 2001)
Administering Cisco QOS in IP Networks, by Mike Flannagan (Syngress Publishing, 2001)
The Blue queue-management algorithm, http://www.thefengs.com/wuchang/work/blue/