Vyatta Community Edition 4 (VC4) open-source network operating system
is now available. VC4 delivers significant scalability improvements
and expanded application support to its router/firewall/VPN feature
set and achieves a 10X price/performance advantage over proprietary
network solutions. New features include: enhanced QoS, ECMP, GRE
IPinIP, PPPoE, WAN load balancing, VPN & DHCP Client and more.
details at http://www.vyatta.org/forum/viewtopic.php?t=277