Hello,
The graphical network-management tool called cloonix-net has adopted OpenWrt as its default machine, this idea came from Brian Prodoehl and he helped in the realisation.
The tool is at http://clownix.net and it is shipped with both an UML-based OpenWrt and a KVM-based OpenWrt machines.
The tool has the goal of making fast presentation of networking protocols, 2 demos are included as examples, a quagga/ospf demo and an olsrd demo.