OpenWrt Realview appliance
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.
The realview platform is meant for use with QEMU for emulating an ARM system.
More informations on http://openwrt.org
RAM: 128 MB
Documentation for using the appliance is available on http://wiki.openwrt.org/doc/