OpenWrt is a highly extensible GNU/Linux distribution for embedded devices (typically wireless routers). Unlike many other distributions for these routers, OpenWrt is built from the ground up to be a full-featured, easily modifiable operating system for your router. In practice, this means that you can have all the features you need with none of the bloat, powered by a Linux kernel that's more recent than most other distributions.
More informations on http://openwrt.org
Ethernet0 is the LAN link, Ethernet1 the WAN link.
RAM: 64 MB
Documentation for using the appliance is available on http://wiki.openwrt.org/doc/