Anyfi.net is a Software-Defined Wireless Networking (SDWN) forwarding data plane for Wi-Fi. It implements a complete IEEE 802.11 stack, but split in two halves: one for radio access and another for service definition.
Seeing is believing - you really have to try this yourself. Anyfi.net comes pre-integrated in CarrierWrt. Download a firmware image for one of several common Wi-Fi routers and take it for a spin right now.
Extensive online documentation is available, explaining the SDWN architecture as well as data and control plane protocols. The documentation also includes a security analysis and an introduction to the software and its integration.
Installing Anyfi.net software on OpenWrt is now super easy! Step-by-step instructions are available at http://anyfi.net/openwrt/INSTALL. If you already have OpenWrt it shouldn't take more than a minute or two to install the 'anyfi' package.
For those building OpenWrt from source code there is also a package feed on GitHub that you can add straight into your feeds.conf. Building from source also lets you configure a controller, so that you can produce firmware images that will automatically connect back to your virtualized core.
Feel free to contact firstname.lastname@example.org if you run into any trouble!